Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5f6b67685d68ed3…

MALICIOUS

PDF

77.2 KB Created: 2020-11-29 02:37:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c00385760e81bf179c11c339526c93b1 SHA-1: 16a915b75ffe25c711835167677c065759fc0059 SHA-256: b5f6b67685d68ed3e5e10f14bd58b32e6bc39e5ddbfa5286bf8d5553dd5ea553
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 0.9998

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://traffnew.ru/strik?utm_term=nissan+xterra+manual+transmission+review PDF link annotation
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/8980310.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376602/normal_5f9f21f3d7c3c.pdfIn PDF document text
    • https://jamexujibelesuw.weebly.com/uploads/1/3/4/7/134748805/554399.pdfIn PDF document text
    • https://pikotefomulig.weebly.com/uploads/1/3/4/3/134317367/6573919.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383160/normal_5faa0240eb918.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420468/normal_5fa0fd7d4d427.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392647/normal_5f9e274a5eacb.pdfIn PDF document text
    • https://sepenunaxob.weebly.com/uploads/1/3/0/7/130776074/37b38e982360.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393029/normal_5f989d6ba65c0.pdfIn PDF document text
    • https://wegonugu.weebly.com/uploads/1/3/4/0/134040733/7120669.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453334/normal_5fa5b34daa3ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393889/normal_5fa395717fc53.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wilugugo/soxuwosogujasa.pdfIn PDF document text
    • https://s3.amazonaws.com/latufenaw/accuracy_plus_reporting_services.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/11489257807.pdfIn PDF document text
    • https://s3.amazonaws.com/lomiwexuva/juwimexekifak.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_off0000ef65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF65 5020 bytes
SHA-256: 409db16f0b759aede8288c7c141c64e505603f19fa95b014e372691f417a0775
font_01_sfnt_off00010079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10079 11652 bytes
SHA-256: 9bc8a0ee96f0e95b73fe96288fc517f6a87bb571668cb14fdf14e144c3d36a44

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