Malicious PDF — malware analysis report

Static analysis result for SHA-256 39f7d3b74101c5e0…

MALICIOUS

PDF

80.7 KB Created: 2021-03-31 13:10:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 58092e8be85a674563c204f1104d9693 SHA-1: 930469127974882be9def07864e351f50ab92c29 SHA-256: 39f7d3b74101c5e091c0a2ae1f347626b0fa4d4cfb335d6b2d8a3db3fd06c956
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://bologen.ru/123?utm_term=bcca+mammogram+guidelines PDF link annotation
    • https://gibekadizekuni.weebly.com/uploads/1/3/1/4/131452913/184f1752e6c49.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486550/normal_5fde61faf2c71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404113/normal_6060c62ddd8a6.pdfIn PDF document text
    • http://1s.london/juwugodikulophpzql.pdfIn PDF document text
    • http://air-calm2.club/422758594278xs6x.pdfIn PDF document text
    • http://wellwork.site/pay_it_forward_2000_movieqn9c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470380/normal_5fdb1591879cc.pdfIn PDF document text
    • https://fotofewoxa.weebly.com/uploads/1/3/4/8/134849098/4383369.pdfIn PDF document text
    • http://dkblogin-de.com/jatosimusug0oz7u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486984/normal_605c6cff6afd0.pdfIn PDF document text
    • http://tiktokhd.design/kingfisher_airlines_annual_report_2008-_092ddyj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405644/normal_5fe50713d6d00.pdfIn PDF document text
    • http://cadenalia.com/tivazolosageluvivizyfcvz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://28ed73df-463f-41d7-bc87-4635118fd8e0.filesusr.com/ugd/74acc8_97fad241033b49b5bb26c838187fb0e9.pdf?index=trueIn PDF document text
    • https://34e223d5-b18a-4f89-96b3-7c58aa965d90.filesusr.com/ugd/440e29_bd4d57a740484502b8e251315610e986.pdf?index=trueIn PDF document text
    • https://bc260b4e-efc2-469d-9102-9c7234992d76.filesusr.com/ugd/b1b3ad_05836927ab5b479ca7322822c2013c02.pdf?index=trueIn PDF document text
    • http://dowexibagodi.epizy.com/38879460373.pdfIn PDF document text
    • http://kinadawefenipe.rf.gd/small_jpg_to_ppt.pdfIn PDF document text
    • https://32e47638-7206-44c1-ad53-5c6f9176402e.filesusr.com/ugd/e00742_e0da970e47004baabc8a1a2ebcabffa5.pdf?index=trueIn 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_off0000fcb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB8 5308 bytes
SHA-256: a8bc47595e43a258ad665a654f3ec5526a0cd1691b39a36d4e65a68f562b1a92
font_01_sfnt_off00010eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAC 11456 bytes
SHA-256: 3f83d6a088bb5e8bf271ff34fd280ebb8065aff693df72f0e684b90f84f2db04

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