Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b61f3806198256e…

MALICIOUS

PDF

94.2 KB Created: 2021-05-23 09:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 617f93b83e695e7f1d2789f4d3d1106a SHA-1: 5edb712b4a3ad5564dc19bafd85038a58d6880f6 SHA-256: 2b61f3806198256ea9e3a31e5611001e1b240e425d53e1f4dd00a7b03f4cbd5f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to manipulate search engine results or redirect users to malicious sites. One of the primary URLs observed is 'https://zajinet.ru/strik?utm_term=nouns+worksheet+for+grade+1+pdf', which is likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://zajinet.ru/strik?utm_term=nouns+worksheet+for+grade+1+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413575/normal_5fcf5edd53d04.pdfIn PDF document text
    • https://serirufudo.weebly.com/uploads/1/3/4/7/134712976/3411182.pdfIn PDF document text
    • https://gokepitamewema.weebly.com/uploads/1/3/5/3/135325242/6236520.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374703/normal_5ff853e67c171.pdfIn PDF document text
    • https://nafuxiba.weebly.com/uploads/1/3/4/0/134097784/wekulu_zipiwitaviti_duxomagezumawad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386828/normal_6036ca7764278.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480170/normal_604a7af58e8ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447467/normal_600c1fdb35b4c.pdfIn PDF document text
    • https://lutavazakagege.weebly.com/uploads/1/3/1/3/131398084/kebaxudem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ee2a234-fa72-4347-b5b6-de29cfbb1a24/couple_time_capsule_ideas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe3496ad-8967-4ffb-86ae-c23bac8f7e9f/common_interview_questions_for_medical_assistants_with_sample_responses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aacd97d7-5c80-411d-84e9-eef0fee08fb3/what_is_the_starting_salary_of_a_marketing_manager.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f0911bc-30ab-46d6-8a4f-f35355eb5d17/59816894588.pdfIn PDF document text
    • https://s3.amazonaws.com/gonasidupij/38396235332.pdfIn PDF document text
    • https://s3.amazonaws.com/sewamos/nefitiduwagolavuso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/642c77eb-4717-41b9-b131-f2e1fe3c3c8f/what_is_human_geography_ks3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d97070bb-abd1-47c9-b46b-e13340be9fd0/gonalajaboduvu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d915ded-61c4-4bdb-9858-369019d620cf/nejitogarijisekaxovuki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81c190c8-6fe2-4528-b476-24a244808d2f/the_expanded_dbt_skills_training_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8a2cb79-7ce1-4f0b-8c1d-5e8315e051b6/ocr_psychology_research_methods_revision_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/mulerux/what_is_a_phase_in_material_science.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/257cc151-a3b1-46f2-b097-043b6261b5a9/naval_correspondence_manual_2010.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29513921-46af-477e-bda5-ea5992535ed9/47837985398.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07c85ae8-963c-4d81-944a-bb34bc9b9f2e/lyman_all_american_4_turret_press_shell_holder.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF904 6632 bytes
SHA-256: 1e1227c37f9a59fa023fd131b7da3b75ad5afd7f39b2be4695b5a9da3992e32c
font_01_sfnt_off0001096d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096D 3096 bytes
SHA-256: f11a9ff0c7c7f73f861ca5a8b5ea3bdffbe68c30ba030f98554277ae39acaaee
font_02_sfnt_off00011480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11480 5448 bytes
SHA-256: 1dd026f4c0ed6b04e8c62246141f1f4c96f05e0186534e273318b9ccabba9ce1
font_03_sfnt_off00012728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12728 12344 bytes
SHA-256: b717280f99c352ce1abb000a222c8c9453957e1d60ce10b0ac9244a88bda370d
font_04_sfnt_off0001510e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1510E 17340 bytes
SHA-256: ab08c8dea568e0808e19427dae67d00bdcf31e021b88e4fd6e5ec781a95c683f

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