Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4b172edbc5a834e…

MALICIOUS

PDF

66.8 KB Created: 2021-02-25 08:35:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: b5bacfc6d2934c98d0bbb2ebe44a8e22 SHA-1: 483f850d88028cc11c6690d36f5a48312cca4439 SHA-256: e4b172edbc5a834efb2c02e5fa116213604183d9fbdde6de6a0c833f8198b2de
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains a large number of external links, many hosted on disposable domains or link farms, suggesting a phishing or malware distribution campaign. The document body, though heavily obfuscated, appears to contain keywords related to product sales, likely as a lure to encourage users to click the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9706

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://seumenha.ru/award?keyword=hobart+1612+meat+slicer+for+sale PDF link annotation
    • https://cdn.sqhk.co/wifopuzuxiba/eLOheIR/undead_man_walking_code_alpha_omega.pdfIn PDF document text
    • https://cdn.sqhk.co/vesagivara/c5kn2yQ/need_for_speed_no_limits_apk_data.pdfIn PDF document text
    • https://miwunogix.weebly.com/uploads/1/3/2/8/132814940/soliz.pdfIn PDF document text
    • https://jawuvufos.weebly.com/uploads/1/3/4/8/134856807/c131d15e2.pdfIn PDF document text
    • https://tevoletefe.weebly.com/uploads/1/3/1/6/131606261/dogawuko-xigut.pdfIn PDF document text
    • http://zuzorovix.scienceontheweb.net/raleridex.pdfIn PDF document text
    • https://cdn.sqhk.co/rikopekela/6lr6ghE/vefegaroregulobipalizu.pdfIn PDF document text
    • https://datedafobegab.weebly.com/uploads/1/3/5/9/135990096/sofowutuki.pdfIn PDF document text
    • http://xemizawufogutuf.scienceontheweb.net/12299331031.pdfIn PDF document text
    • http://madamzero.com/sisuwedog57to.pdfIn PDF document text
    • http://app-3null.com/fsrm_folder_size_reporta89gt.pdfIn PDF document text
    • https://cdn.sqhk.co/wabajevebe/eAwghKa/ziwisu.pdfIn PDF document text
    • http://xuzerujagojagip.scienceontheweb.net/air_force_academy_map_colorado_springs.pdfIn PDF document text
    • http://zanovekolasin.mywebcommunity.org/rinnai_heaters_home_depot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gurabagoderes.atwebpages.com/panasonic_phone_manual_kx-tga470.pdfIn PDF document text
    • http://lobopekogolo.onlinewebshop.net/stairway_to_heaven_korean_drama_park_shin_hye.pdfIn 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_off0000d22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22E 5464 bytes
SHA-256: caf7e4e8ec9360973faf367e8aa94857ad89f9345f36fc1714afeeff74482a93
font_01_sfnt_off0000e4b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B4 10860 bytes
SHA-256: ef4137847dbb70a404480b17a453b7922d6f84db3d04650dbc5db0a44c1fc313

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