Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e1dd8526aecab1d…

MALICIOUS

PDF

67.2 KB Created: 2020-11-28 00:32:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 222ea1f682ad9a1b77d5392aaeaead44 SHA-1: 297be6e8cb7dfe26a0a8d6e8868c44f320eeeb06 SHA-256: 5e1dd8526aecab1d424ae50285accba5e69898b60236c8532739af433e738ada
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 0.9997

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://trafftec.ru/aws?utm_term=buddyfight+online+game PDF link annotation
    • https://virenogapugutu.weebly.com/uploads/1/3/4/6/134635416/lefuwo-vejawurakovuxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370528/normal_5fbcc0496d63e.pdfIn PDF document text
    • https://jewelalebun.weebly.com/uploads/1/3/4/5/134585336/13c7b466a.pdfIn PDF document text
    • https://gudojovevisepu.weebly.com/uploads/1/3/4/3/134314990/930f6844.pdfIn PDF document text
    • https://nosokubidudat.weebly.com/uploads/1/3/4/3/134321305/9084549.pdfIn PDF document text
    • https://gemenudotipetal.weebly.com/uploads/1/3/2/6/132695720/5463cfdf2c6b85f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/677810b6-b357-4e0c-a3e2-2a3bf955a4ca/sutomajisitetabugogovo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcd1f6a2-28f7-4d77-a24d-83fe32c3fbb1/the_battle_of_the_five_armies_torrent.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae1547dd-872c-4713-95cd-59742cc98d69/vofabojoru.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/fuzisugimidozap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0694ce1-4c2d-423e-85ad-238e0cb4200b/16361124686.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_off0000cb45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB45 5200 bytes
SHA-256: e4c139c3e4ded2b5c86f6981b2c7fa34f203dd06ade05c14c9ebe8cd189a1608
font_01_sfnt_off0000dce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE1 10396 bytes
SHA-256: 9081e6fe3261be7026c52347f0b97457895da29839be6cb6aef244e8186c0254

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