Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cf49913460290ba…

MALICIOUS

PDF

73.2 KB Created: 2021-02-20 02:26:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: bad114b10801e3e3c92d13e439e38645 SHA-1: d3604ae280aff8802df7f091773636fb02bf263e SHA-256: 8cf49913460290ba1b4d00abe845957b2b90febe54a485f65cecc7d0883efaec
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One of the primary URLs points to a PDF on a disposable host, which is likely a secondary payload or further redirection. The document body contains garbled text and a reference to 'wkhtmltopdf', indicating it was likely generated programmatically.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://leonvi.ru/strik?utm_term=how+much+does+27+months+equal PDF link annotation
    • https://fenibelamej.weebly.com/uploads/1/3/4/4/134464240/cc324.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413573/normal_601ff7509a01e.pdfIn PDF document text
    • http://vvinorama.website/how_to_write_bff_in_plural5oumf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457302/normal_60295de67c949.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379970/normal_5fd7120f57ecc.pdfIn PDF document text
    • http://lajenasuwo.iblogger.org/jodugafugopisegexa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378623/normal_601006379952c.pdfIn PDF document text
    • http://zizubur.22web.org/bupexutumenuvarikuziw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449769/normal_5fe1d3a66d292.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482648/normal_5fcb04bef05fa.pdfIn PDF document text
    • https://cdn.sqhk.co/wafifovuwel/idZ8vs6/79488072321.pdfIn PDF document text
    • http://bigswinner.space/los_4_acuerdos_completo6hm0z.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://bojilukirifep.rf.gd/82171679272.pdfIn PDF document text
    • http://kepijemimubu.rf.gd/honda_2000i_companion_generator_for_sale.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33A 5308 bytes
SHA-256: 1c3f5e65dff9dd6527fc1cea369199aefbd45b6bce05afaf5219708835b58279
font_01_sfnt_off0000e535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE535 10856 bytes
SHA-256: 1034e66cb4e71c6b665f62ff64fe3e1ac9e99bd1c1429f8aad8497bcf8bd078c
font_02_sfnt_off00010a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2C 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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