Malicious PDF — malware analysis report

Static analysis result for SHA-256 23291fd32a327955…

MALICIOUS

PDF

78.6 KB Created: 2021-04-20 01:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 68a0b445d241c5fc959512de360ca221 SHA-1: 509b1122ffd5cbffe9b5d591651d127c96646a69 SHA-256: 23291fd32a327955937c2757fd008cba018006aa31897acc964dca9abd9073bf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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 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://baarspo.ru/strik?utm_term=garmin+220+won%2527t+charge PDF link annotation
    • http://ig-copyrightviolation.com/saxaronoxiwamimobimutnopz.pdfIn PDF document text
    • http://sentytld.online/what_is_humanistic_approach_in_language_teachingfyv9m.pdfIn PDF document text
    • http://zhk-samolet-krasnodar.info/45679880940kyp9c.pdfIn PDF document text
    • http://tozemudezajif.mygamesonline.org/22049150729.pdfIn PDF document text
    • http://gixipures.sportsontheweb.net/articulos_cambio_climatico_actuales.pdfIn PDF document text
    • http://afracheat2.xyz/billie_eilish_instagram_name_changedcr3g.pdfIn PDF document text
    • http://rolivazugatar.scienceontheweb.net/zerojifomuf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rawuvotatu.rf.gd/97565960606.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06d1ae85-3a73-499e-9958-42667bf77203/venn_diagram_questions_for_cat_exam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2db37a16-0adf-4292-ad55-b19659d72f99/covid_19_safety_measures_for_construction_site.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/886b1b18-9283-44bc-bf26-e0f8b57a934d/padofexenuvegidazisezir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/189aa4ff-8a4a-4d9d-9b44-832618e985d4/reaccion_de_combustion_completa_del_heptano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22f50f73-8b23-4b38-91d3-1c55e1f716e1/18161075056.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/242e6e16-9373-4b97-ad9e-2a5ac33cd731/fishman_aura_spectrum_di_preamp_review.pdfIn PDF document text
    • http://togujekunigek.rf.gd/18278827959.pdfIn PDF document text
    • http://matewedidoxeber.onlinewebshop.net/cochlear_phone_clip_quick_guide.pdfIn PDF document text
    • http://zegetafirotazaz.atwebpages.com/48879557264.pdfIn PDF document text
    • http://mugazukadum.onlinewebshop.net/best_paper_airplane_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e13ac6b-992c-448b-bb18-13ea6f5ddb85/old_spice_logo.pdfIn PDF document text
    • http://zujakogi.onlinewebshop.net/vajepoxuzogelonere.pdfIn PDF document text
    • http://xofigawarogipiw.rf.gd/11265882062.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d15cf3d-e24b-4d22-ab40-297b67ea4452/vakadegabebopaneto.pdfIn PDF document text
    • http://temomij.epizy.com/15633835256.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_off0000f3bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BD 5436 bytes
SHA-256: 1b377f7726a6c176891c25f19fc8a78b859c10a681a7646000f36eb66e2e6aa7
font_01_sfnt_off0001062c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062C 11020 bytes
SHA-256: 511ba787ec142e36e61b9f5c677987ff26fd606ccc62d7e6ba3a8c24ceb70831