Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3ff2b38b35ca757…

MALICIOUS

PDF

72.7 KB Created: 2021-02-05 14:13:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: ca10eba7c63bc76d8cb0e6805c573f3f SHA-1: 741e2b28108ca9dca6353fc779ea52ca31152b46 SHA-256: a3ff2b38b35ca757f3818903cf1cde50916167f8aa8129b879709b5ef9ca14a1
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful websites. The presence of embedded URLs and the nature of the link farm heuristic point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/123?utm_term=blonde+female+cosplay+ideas PDF link annotation
    • http://kawlites.online/blockchain_white_paper_satoshi74pdt.pdfIn PDF document text
    • https://cdn.sqhk.co/risejesob/ahdgfug/car_running_while_pumping_gas.pdfIn PDF document text
    • http://0fruits.space/mubakowonanasadenosurog5dqqf.pdfIn PDF document text
    • http://circulyarkadigital.xyz/losizosoxezibugavipewg2u1.pdfIn PDF document text
    • https://cdn.sqhk.co/xasakeza/icYDieH/49274122290.pdfIn PDF document text
    • https://cdn.sqhk.co/sativomofij/gfyhhvg/byutv_shows_dwight.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/hd8jjgi/my_sprint_rewards_me_login.pdfIn PDF document text
    • https://cdn.sqhk.co/jumifokujuje/4l4uhgN/83019430094.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478664/normal_601883e28de9f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377114/normal_5febfab66b8a3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fububosuvakosal.epizy.com/equations_for_uniformly_accelerated_linear_motion.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/iou_coupon_template_word.pdfIn PDF document text
    • https://s3.amazonaws.com/dinilederu/clean_sheet_translate_to_spanish.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/kuduvumejovova.pdfIn PDF document text
    • http://vovijez.epizy.com/fuloguguxoxob.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_off0000dff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF4 5356 bytes
SHA-256: 2411c628a82138511f28009f1c8ccc411a26fe8f7fd9548863ec17dd1e25edff
font_01_sfnt_off0000f228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF228 10604 bytes
SHA-256: 1eb0589c76d231f06d29dd8763e180a0b673a9d3d1e765dbf0e3d20063ba5fe0

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