Malicious PDF — malware analysis report

Static analysis result for SHA-256 90a57e833fe3f70b…

MALICIOUS

PDF

70.4 KB Created: 2020-12-20 19:45:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3e7aa9b539b9def788186a7a2ef1db8b SHA-1: dfe2f6465b4eb40f4d1bf95b745512356125c8a0 SHA-256: 90a57e833fe3f70be615c4c3b67c8488e60a041b1dbf7127c595a41ff592a90d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are to SEO-optimized PDF documents, suggesting a link farm or phishing attempt. The primary malicious URL identified is traffking.ru, which is likely used to host a phishing page or distribute further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://traffking.ru/strik?utm_term=economics+semester+exam+study+guide+answers
    • https://mokogexikimowo.weebly.com/uploads/1/3/4/3/134321985/83074789e.pdf
    • https://monubigikupo.weebly.com/uploads/1/3/4/4/134493781/budogumaguvo.pdf
    • https://palifeselaliku.weebly.com/uploads/1/3/4/4/134441248/95f23ca72ceffd8.pdf
    • https://cdn-cms.f-static.net/uploads/4444369/normal_5f9f45af6684c.pdf
    • https://cdn-cms.f-static.net/uploads/4367960/normal_5f91efa863794.pdf
    • https://vadurevagide.weebly.com/uploads/1/3/3/9/133999829/zizelobawamib.pdf
    • https://vufupobuzalezu.weebly.com/uploads/1/3/4/8/134853030/2443274.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/c3661a09-dd20-4015-9f31-7514fde653fd/fisher__paykel_oven_manual_bi602.pdf
    • https://uploads.strikinglycdn.com/files/7e2233d5-ae69-455a-bcac-e55354b5d19f/glow_in_the_dark_epoxy_pigment.pdf
    • https://uploads.strikinglycdn.com/files/f058065d-9601-4dfa-b744-f36fe41c9b12/gateway_nv77h23u_specs.pdf
    • https://uploads.strikinglycdn.com/files/ce497011-c641-4098-9129-f72f5688fa84/xebewipawerakifufavikubuw.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c935.bin
b6ff79e379d5b276c8f559e52824d8e7e59ede8ddfd546b7cf72f1b91a33e5b2
pdf-font-stream PDF embedded font (sfnt) at offset 0xC935 5328 bytes
font_01_sfnt_off0000db45.bin
66f72f2222072a0a33ba0fec111b902f93976928fd8e8db930955e4111a253ed
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB45 10460 bytes
font_02_sfnt_off0000feae.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAE 4324 bytes