Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3b66c035900f3ef…

MALICIOUS

PDF

74.2 KB Created: 2020-11-18 01:46:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: d9ae3e5f956e2706b55a978e4c948e2e SHA-1: d176f0f3a267fa1b871510f3adcbbeab889d737e SHA-256: c3b66c035900f3ef969e27494ed5abecdc54be4af1475804712cfb66a354e4f9
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, and is flagged by ClamAV as Pdf.Phishing.Trojan. The ML classifier also strongly indicates maliciousness. The primary URL, 'https://trafftec.ru/strik?utm_term=data+and+computer+communications+solution+manual', suggests a lure related to technical documentation, likely to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafftec.ru/strik?utm_term=data+and+computer+communications+solution+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368475/normal_5fa70b116b2b5.pdfIn PDF document text
    • https://fuvepuzineg.weebly.com/uploads/1/3/4/4/134463404/5d9f4dee6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368949/normal_5f87b66dd4d6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427811/normal_5f9bc9bc72459.pdfIn PDF document text
    • https://tofavasexivefet.weebly.com/uploads/1/3/4/5/134578877/lazawirabupapizonozi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372985/normal_5f90633871871.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368266/normal_5f8a2308c3363.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/wowabaxisefidet-nikuvajekibesim-napoxalapa.pdfIn PDF document text
    • https://bipikive.weebly.com/uploads/1/3/4/3/134342269/kekizijowavijela.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://s3.amazonaws.com/kosamupim/chase_foreign_exchange_rate_calculator.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_off0000cf9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9E 5100 bytes
SHA-256: 5f38e9029f3318916081ce5702dc87c316029a25c69b35b125e1a53e15411e17
font_01_sfnt_off0000e0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CD 13408 bytes
SHA-256: 4c6bac7c6e36901a2997bbd4328710c63446d09a9d685320212a54633a8fbf32
font_02_sfnt_off00010b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B93 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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