Malicious PDF — malware analysis report

Static analysis result for SHA-256 f157760e48caa770…

MALICIOUS

PDF

71.1 KB Created: 2021-01-07 06:41:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 3f3a3c6fb8e799f2f1d27c1cb185d586 SHA-1: 71dd76f97a704e8d1612437cea8b8eba245f4b94 SHA-256: f157760e48caa77075e4b05d8882fb613ead076164e2e677160204042a810288
156 Risk Score

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 numerous external links, with a primary suspicious URL pointing to 'traffset.ru', likely intended to redirect users to malicious content. The PDF structure suggests it's part of a link farm, designed to host and distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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/123?utm_term=sony+tv+live+indian+idol+voting PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4446782/normal_5ff1865c5be5a.pdfIn PDF document text
    • https://zusaneji.weebly.com/uploads/1/3/0/8/130813769/6393733.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481403/normal_5fd9bd24b937f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404512/normal_5fb2a1c18d343.pdfIn PDF document text
    • https://vumopofusub.weebly.com/uploads/1/3/0/8/130874587/5b4a9f3e6cf40a.pdfIn PDF document text
    • https://cdn.sqhk.co/sofetarunox/Jicgjhg/lock_screen_shortcut_macbook_air.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366397/normal_5f873fc0d293b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383146/normal_5fad67b64419b.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/a73c8988-7f71-423e-83af-bd4d408b1c3a/jekubod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e22f3ab6-c189-49a7-8c5f-41bb50bae492/zedazowedawogigisakizuni.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_off0000db88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB88 4984 bytes
SHA-256: 66ee726eea0b5a4aa98a1af81bd2c024e043fd3d6c1a462bc2f9d9d6d9d1335f
font_01_sfnt_off0000ec9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9F 10360 bytes
SHA-256: 72059c44d42f6e812b3e7dbf93a843b1695a84b6bdd1ab2ec46cdfd46bff4649

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