Malicious PDF — malware analysis report

Static analysis result for SHA-256 732f6bf714a7d17d…

MALICIOUS

PDF

70.5 KB Created: 2020-11-12 23:43:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 25284e472ee650bf9c8a599ff5acdac4 SHA-1: df8712a81feb887971c453b28bfdbb0b35317dc8 SHA-256: 732f6bf714a7d17dac21abd93e19f4222e156e243c0d321d10310975565143b2
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-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.
  • 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://traffine.ru/123?utm_term=chamberlain+clicker+klik2u-p2+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374704/normal_5fa375aa8a3cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374177/normal_5f8cc2143c4be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408479/normal_5f989ec5e32cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369152/normal_5f8b9968a9790.pdfIn PDF document text
    • https://nudopimiga.weebly.com/uploads/1/3/1/0/131070212/9842453.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381340/normal_5f8cf2c5de704.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369923/normal_5fa5a5cb46cbb.pdfIn PDF document text
    • https://jowodetuleguzu.weebly.com/uploads/1/3/1/8/131856173/4361480.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383567/normal_5fa0dc29b494e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/707a36bd-4533-4c8a-95fa-7f9346a7c9cd/pajotetasotujovupuwow.pdfIn PDF document text
    • https://s3.amazonaws.com/gifojuxaxeva/xuzidakanor.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC70A 5080 bytes
SHA-256: a54757d62a58bf201ae7f1e0d481140e6124e47499faee9bda904ceffadaae1e
font_01_sfnt_off0000d82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82A 11488 bytes
SHA-256: a2d8e2839dfdf477c32f33c62b844d6fd719dc48fe206db88c6f45695b86d963
font_02_sfnt_off0000ff17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF17 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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