Malicious PDF — malware analysis report

Static analysis result for SHA-256 509f380b4ffcfd44…

MALICIOUS

PDF

61.6 KB Created: 2020-12-21 00:02:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: a40faefabe46802308c239f62b43502b SHA-1: 94618bb992dc5c343ddc2abf52252b1c7958389b SHA-256: 509f380b4ffcfd44215aeca88e6ab1d3319fa2d3d345e4e98afcfad59db345a5
146 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document exhibits characteristics of a callback phishing or tech-support scam, as indicated by the 'SE_CALLBACK_LURE' heuristic. The presence of multiple external URIs, including one pointing to 'trafffe.ru', suggests an attempt to redirect the user to malicious content or phishing pages. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely exploiting PDF vulnerabilities to deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/strik?utm_term=monroe+expressway+toll+payment PDF link annotation
    • https://xitukuwelup.weebly.com/uploads/1/3/4/3/134340625/gipij.pdfIn PDF document text
    • https://lexawuvake.weebly.com/uploads/1/3/4/6/134610488/713737.pdfIn PDF document text
    • https://petarukezatu.weebly.com/uploads/1/3/3/9/133997491/puvatidupus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443574/normal_5fc2b0e880632.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493541/normal_5fcbbbe23012d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383577/normal_5fd1606a48f76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402718/normal_5fa27f2b181f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451940/normal_5fa055bd71ef7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414494/normal_5fc92a0c5c4fd.pdfIn PDF document text
    • https://depemazijibibo.weebly.com/uploads/1/3/4/8/134846300/sipapo_bedob_fasorefilo_detebesum.pdfIn PDF document text
    • https://foposivore.weebly.com/uploads/1/3/4/4/134472686/rolasote.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0f24c403f5353fd95fd42/t/5fc2c2097acac6192a1b7114/1606599179581/tudexenejenodixawepizus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ec403a1-9ed6-46ac-92bf-2c91f6504bd1/83860757689.pdfIn PDF document text
    • https://s3.amazonaws.com/lerezazo/modify_email_template_woocommerce.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/linking_verbs_song_for_kids.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_off0000b345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB345 5232 bytes
SHA-256: afb3f777b5c2d1c3a098c0e00994990111456a11afb7064c759a383a38b77512
font_01_sfnt_off0000c51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC51E 10816 bytes
SHA-256: a42d83fa0db962767ec5ca86ce6cf4590319c03a5f0515a130b7b1da9a1ee1d6

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