Malicious PDF — malware analysis report

Static analysis result for SHA-256 487d31dbb81b3bd5…

MALICIOUS

PDF

79.0 KB Created: 2021-01-15 05:46:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 637138f142cd53228b997a2f656ab315 SHA-1: eb37afd14d70d4aada4165e40072a8d4327caddd SHA-256: 487d31dbb81b3bd5b6390c78627428f2626114be7983bb91be7581394c4fa02a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded URLs likely serve to redirect users to malicious sites or download further payloads.

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://traffnew.ru/123?utm_term=when+was+the+term+lgbtq+first+used PDF link annotation
    • https://site-1167988.mozfiles.com/files/1167988/steam_link_controller_overlay.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452376/normal_5fdb9e4780042.pdfIn PDF document text
    • https://federadedeladol.weebly.com/uploads/1/3/4/6/134626130/891e90f21a3763.pdfIn PDF document text
    • https://kaxogirigajel.weebly.com/uploads/1/3/4/6/134611066/neretaritalix.pdfIn PDF document text
    • https://beserozufem.weebly.com/uploads/1/3/4/8/134864657/varetatu.pdfIn PDF document text
    • https://site-1168251.mozfiles.com/files/1168251/shooters_world_powder_review.pdfIn PDF document text
    • https://basurujilitafap.weebly.com/uploads/1/3/4/5/134595952/7e101e82613820.pdfIn PDF document text
    • https://rutaluxunenore.weebly.com/uploads/1/3/0/7/130740368/2182487.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486200/normal_5fc67d4c33cb7.pdfIn PDF document text
    • https://nusosujorogu.weebly.com/uploads/1/3/4/5/134589145/tobofog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393488/normal_5fd939cf94dc0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452618/normal_5fedaad22ad4c.pdfIn PDF document text
    • https://tolojosokuriw.weebly.com/uploads/1/3/5/3/135326177/gidogaf.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
    • https://s3.amazonaws.com/dewazewokib/jonovuzesupa.pdfIn PDF document text
    • https://s3.amazonaws.com/lebejos/android_one_phones_uk.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_off0000e8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C6 5464 bytes
SHA-256: e818021b3ba211074869f99be6aab3aaed4ca612982daaf35511e5388d24a758
font_01_sfnt_off0000fb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2D 11088 bytes
SHA-256: 817640a85948e5d83392aa8836363d36756f73e7ccc5095f935e46f28dfd6ec0
font_02_sfnt_off000120f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F8 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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