Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf392bcbb22cf077…

MALICIOUS

PDF

80.1 KB Created: 2020-11-20 00:00:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed73dd15feb2ba3d0ed577d4a6d81e24 SHA-1: 18f5b62ff17b9cdaffd80a0dc962362f518ef083 SHA-256: cf392bcbb22cf077c0622dea2f675d5f4a83b144dee446a4829e082b481cb01a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, flagged as a link farm, and is detected by ClamAV as a phishing trojan. The ML classifier also strongly indicates maliciousness. While no scripts were explicitly extracted, the PDF structure and external links suggest it's designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/aws?utm_term=bhutan+travel+guide+book+pdf
    • https://cdn-cms.f-static.net/uploads/4387243/normal_5f8d4a7e2054d.pdf
    • https://cdn-cms.f-static.net/uploads/4404124/normal_5f92772b69a93.pdf
    • https://cdn-cms.f-static.net/uploads/4367289/normal_5f8bb307d9a30.pdf
    • https://cdn-cms.f-static.net/uploads/4421352/normal_5fa331bd685a3.pdf
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/7885719.pdf
    • https://cdn-cms.f-static.net/uploads/4366659/normal_5f871f0e4ba33.pdf
    • https://cdn-cms.f-static.net/uploads/4375528/normal_5fa168c559351.pdf
    • https://jususisizeka.weebly.com/uploads/1/3/4/2/134266965/xamigi.pdf
    • https://cdn-cms.f-static.net/uploads/4384634/normal_5f9255e5d9268.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/suxiweke/9934559633.pdf
    • https://s3.amazonaws.com/jotizifime/86674699704.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fae5.bin
eeeb54b66d060cc421d18faa2370a41a746ecd72b2aff0f4f68a0b3564eb81e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE5 5436 bytes
font_01_sfnt_off00010d64.bin
e5924c6ad4fdc6dc46b6d35b698a282688505bb4748b30062adaa589eb6997f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D64 11300 bytes

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