Malicious PDF — malware analysis report

Static analysis result for SHA-256 81a02f6e7b2e0567…

MALICIOUS

PDF

81.2 KB Created: 2021-01-14 20:21:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f4121a8a3db101267b051990991783bd SHA-1: ec6927cdf3ed4d27e7d2df84c449a821c6f28a8e SHA-256: 81a02f6e7b2e056718c7eca5ded15acc040ab6040a932809e2220674ea749a62
244 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure. The embedded content, though heavily obfuscated, suggests an attempt to disguise the malicious nature of the links by referencing a game. No scripts were extracted, but the overall structure and heuristics point to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/wb?keyword=good%20pizza%20great%20pizza%20vampire%20slayer In PDF document text
    • https://nasolebad.weebly.com/uploads/1/3/4/6/134695036/b79d0ba29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424996/normal_5f9d4adb0e731.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391620/normal_5fffe70f37264.pdfIn PDF document text
    • https://lidawutoroliv.weebly.com/uploads/1/3/1/8/131872032/2906888.pdfIn PDF document text
    • https://cdn.sqhk.co/vabadoma/xjeifhg/disney_cruise_alaska_pool.pdfIn PDF document text
    • https://cdn.sqhk.co/bijininabex/bjaWFgj/falijuwi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385415/normal_5f8e10b681027.pdfIn PDF document text
    • https://dujefeva.weebly.com/uploads/1/3/4/5/134589135/goxur.pdfIn PDF document text
    • https://xekixudag.weebly.com/uploads/1/3/4/3/134336078/747ffe1f.pdfIn PDF document text
    • https://zitozujenuzudip.weebly.com/uploads/1/3/4/0/134042901/famor.pdfIn PDF document text
    • https://cdn.sqhk.co/kizafizutuw/mHVgfCl/video_player_download_for_windows_xp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415308/normal_5fcd5b2432bac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453747/normal_5fc361b97f30a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465015/normal_5fc04d3f3cf71.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://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_off0000f1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CC 5204 bytes
SHA-256: 181b09b3b2fb98702600fae74e3e2b9d48ab78c016c06bb4155f9e0c11a625f3
font_01_sfnt_off000103a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A4 11104 bytes
SHA-256: d76c7556c843bd9885edab8394da778d9be793c549f63109f9b2332922422535
font_02_sfnt_off0001296e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296E 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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