Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd60aeb57477ef71…

MALICIOUS

PDF

69.7 KB Created: 2020-11-13 13:15:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 2e64a3942eda01e921b3d19e805a236b SHA-1: 53a77919c280dee22ba1e6e1d68622ed7108f520 SHA-256: fd60aeb57477ef718823444dbf991ca674e0ff7795bbbd99e07221aaf2ddbdf6
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier. It functions as a link farm, directing users to numerous external URLs, including one at 'trafffe.ru'. The document's content is obfuscated, but the presence of many external links suggests an attempt to redirect users to potentially malicious sites for phishing or other malicious activities. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafffe.ru/123?utm_term=occupational+therapy+graduate+school+personal+statement+examples PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369173/normal_5f8a1ad81f8cc.pdfIn PDF document text
    • https://faluwizux.weebly.com/uploads/1/3/4/3/134372305/melezo.pdfIn PDF document text
    • https://gapudozesaneg.weebly.com/uploads/1/3/4/5/134525911/bapovibili.pdfIn PDF document text
    • https://welavofewefose.weebly.com/uploads/1/3/0/8/130813025/fowafibetu-mewubok-nonokalegunug-nosili.pdfIn PDF document text
    • https://mogunugive.weebly.com/uploads/1/3/4/3/134381007/0523178536d5a36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418197/normal_5f9586af1c5b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387929/normal_5f8d27bcca417.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371495/normal_5f959ce6e944e.pdfIn PDF document text
    • https://veraweno.weebly.com/uploads/1/3/0/7/130739577/pobenirabexu.pdfIn PDF document text
    • https://finiluxexolije.weebly.com/uploads/1/3/1/8/131856594/893e8f3e40.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6d42954-f715-42fe-aede-c8652241d3c8/72106630942.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76e0c7cd-2609-47b1-a731-c388989fef53/feduvobiduriberonodajal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bd9cf09-3d0c-4332-8387-c38f186b6f00/how_to_put_eit_certification_on_resume.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_off0000d2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AB 5684 bytes
SHA-256: 25861d59cfc6bcc3d922555d6224d5268dd2d4567555e81fbc9af4d33f81a0bb
font_01_sfnt_off0000e5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DF 10336 bytes
SHA-256: 019291414d12092f7b1b8e9e8f642d13ce61ecf40182e34da2ce390e01d3fdce

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