Malicious PDF — malware analysis report

Static analysis result for SHA-256 3644741c7000d35d…

MALICIOUS

PDF

77.1 KB Created: 2021-05-06 09:26:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c56d9e067f17c882e8569ff03bda11e3 SHA-1: 225943509dff6c3f57c4ba9a8da26f87d085eb65 SHA-256: 3644741c7000d35d728198ce77bc78f227a67005603c775e3acb67776c9fb142
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a title that appears to be a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://fokemale.ru/strik?utm_term=what+does+it+mean+to+be+a+democratic+state PDF link annotation
    • http://ndfnasg.xyz/new_king_james_version_study_bible_free_downloadred4l.pdfIn PDF document text
    • http://tututot.mygamesonline.org/32540960637.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380681/normal_6036c98829f56.pdfIn PDF document text
    • http://zatutajijiti.getenjoyment.net/fepub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494657/normal_602d713a95bae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448743/normal_605703e21a588.pdfIn PDF document text
    • http://italysummer.space/8936058135608z6u.pdfIn PDF document text
    • http://svarka-aurora.online/formato_de_certificado_medico_cdmxf1rqq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367922/normal_6069e910dfb89.pdfIn PDF document text
    • http://cethq.xyz/what_is_narrative_in_literatureiscdj.pdfIn PDF document text
    • http://organicnu.info/4979160068617do4.pdfIn PDF document text
    • http://dororuminaxa.mywebcommunity.org/reforma_do_estado_e_administrao_publica_gerencial.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468531/normal_6021900f6f683.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/c0930902-e6c7-40ef-badc-181cc12f1cf8/66838240550.pdfIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/xuxonezodiwubizagupat.pdfIn PDF document text
    • https://s3.amazonaws.com/nabifovu/chemistry_dictionary_software_free_for_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b55cc8f-c9e1-4656-ad91-c6710ada8c1e/elements_of_a_system_in_mis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/156e32e5-460c-4bf4-8902-f8841656d0e3/edgar_allan_poe_complete_tales_and_poems_textured_pages.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/wisurumiwokunaga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/051736e6-a429-4f3e-9415-d2ba814e39b9/marketing_project_manager_salary_seattle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83d745a8-35c6-4e99-99d8-6857973d9077/riyad-us-saliheen_vol_3_urdu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/627e88b4-cf68-4ccd-b681-161cd08f2990/what_is_the_focus_and_purpose_of_educational_psychology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc7b2497-6eb0-47c0-b85f-f344064da350/machine_learning_engineer_job_description.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4dad8af-f627-4b23-ac5c-a9224d14a578/muludatubeli.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/ark_survival_evolved_ipad.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF159 5300 bytes
SHA-256: 4b2aba3ab6a46cc359de7a30350372e84b51f155dcebb9fa904efe29dd5beb13
font_01_sfnt_off0001033e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033E 10656 bytes
SHA-256: 57ae10d24fda70a7dca4e316ef43955b75fbd33d1814870e7a8c6b46a9b044de