Malicious PDF — malware analysis report

Static analysis result for SHA-256 7af9828a010fcfde…

MALICIOUS

PDF

82.0 KB Created: 2021-02-24 16:37:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 9b4f9996e29112e949307ca09c2e7d39 SHA-1: 15402c0bdfaf2f65a992e3e93c3b0e4553a2243d SHA-256: 7af9828a010fcfdefe97872c0daf46d44e56fc82a62ffbbea1cf61382ddf4207
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-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://druttle.ru/award?keyword=spring+framework+guru+swagger PDF link annotation
    • https://kawuzuvom.weebly.com/uploads/1/3/1/3/131379118/2869692.pdfIn PDF document text
    • https://paporese.weebly.com/uploads/1/3/1/0/131071113/8313676.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447662/normal_5fd0711048633.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376602/normal_602da395ed1f9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500417/normal_5ffd6ad7de148.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475720/normal_5fedad3f6b6c6.pdfIn PDF document text
    • https://mafenipo.weebly.com/uploads/1/3/4/8/134879688/jifigut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448357/normal_6033b899b1e5f.pdfIn PDF document text
    • https://bopilopuneliniw.weebly.com/uploads/1/3/5/3/135304065/bewita.pdfIn PDF document text
    • https://rurasaza.weebly.com/uploads/1/3/4/8/134869927/b559b14a916fb61.pdfIn PDF document text
    • https://kodugeji.weebly.com/uploads/1/3/6/0/136089350/952d059d1b26.pdfIn PDF document text
    • https://neruwutuwi.weebly.com/uploads/1/3/5/9/135960217/puxalebudum_ribiwilaxil_bigipat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459464/normal_60143fb0118bc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gafodix.myartsonline.com/7823281916.pdfIn PDF document text
    • https://s3.amazonaws.com/gedexim/63685935329.pdfIn PDF document text
    • http://wutejaxevewef.myartsonline.com/the_complete_idiots_guide_to_music_theory_by_michael_miller.pdfIn PDF document text
    • http://lumosaneja.onlinewebshop.net/90313599512.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10387 5448 bytes
SHA-256: 5a7189ee01e439a3844929bb82ec1fd8b085a861f1eeb7b67cf3e5e13dea2173
font_01_sfnt_off00011613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11613 10796 bytes
SHA-256: d8994e99211401749f23b52eaf20ccbd521dcbef1e4fcaf73eb12de018db84be

Open this report in the interactive analyzer, or submit your own file for analysis.