Malicious PDF — malware analysis report

Static analysis result for SHA-256 351510afa904d153…

MALICIOUS

PDF

66.1 KB Created: 2020-12-04 16:18:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: bf59321bd868ab61e44ace95f3c53fb6 SHA-1: d65a14ae18e1ae126b42b97531079ed10c5fb480 SHA-256: 351510afa904d15319b6f0104e95a402fa0832ee3d05bd806c796d3535ded622
156 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 5

  • 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.
  • 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://traffset.ru/strik?utm_term=dead+man%2527s+cell+phone+pdf PDF link annotation
    • https://xewoweduvaji.weebly.com/uploads/1/3/4/6/134680405/6512875.pdfIn PDF document text
    • https://fekalebewobazo.weebly.com/uploads/1/3/4/6/134668576/bd5f52a0fbf49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470825/normal_5fad449030000.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389085/normal_5fbf6c30bbe91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414489/normal_5fbe6ed06de77.pdfIn PDF document text
    • https://bugajikiwolano.weebly.com/uploads/1/3/4/4/134471946/kitupanetedu_bulibololekisi_gulelerarojoxo_kuloxaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413369/normal_5fa6b8c059bc6.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/d0184238-8b07-48bf-ad68-e0779697fa15/gugupe.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4d673c02f22b9d039e5c/1606372713829/mefesetiwezazibosekutum.pdfIn PDF document text
    • https://s3.amazonaws.com/ninazarila/punepog.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd120d4b66d17947f731fc/1606226446506/the_ac_power_adapter_type_cannot_be_determined._the_battery_may_not_charge.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_off0000c36a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC36A 5332 bytes
SHA-256: 2a36343c0322e7bb8929d46d6840929536054916062e257a226f27167e3f4627
font_01_sfnt_off0000d57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57D 11300 bytes
SHA-256: 803e820f49d15c283ca5ea1246492aa3c33f8cfa71fda4027cd05ce92e5af3f3

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