Malicious PDF — malware analysis report

Static analysis result for SHA-256 a57439cf286fc2b0…

MALICIOUS

PDF

75.2 KB Created: 2021-01-21 06:20:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 116d51fefbade1563ce182cefea779a2 SHA-1: f3be8fccab603fde4fb8c4628de62874491f48df SHA-256: a57439cf286fc2b0599ef87f9c21e957ff9631d43a22d2c3ce732781093480d0
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. Heuristics indicate it functions as a link farm with numerous external URIs, including one pointing to 'trafffe.ru'. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs. No scripts were extracted, but the overall structure and URL findings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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=bible+verses+for+youth+leaders PDF link annotation
    • https://cdn.sqhk.co/jekefebiba/chighie/85885015530.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408174/normal_60087dcb82d6f.pdfIn PDF document text
    • https://cdn.sqhk.co/fodibaniwe/csIuibB/wwe_smackdown_live_fox.pdfIn PDF document text
    • https://cdn.sqhk.co/jutusaxibu/hegcyih/1252848736.pdfIn PDF document text
    • https://cdn.sqhk.co/bugabowozi/2vwiaij/snoring_elephant_puzzle_transylvania.pdfIn PDF document text
    • https://site-1182116.mozfiles.com/files/1182116/gurukukuzuve.pdfIn PDF document text
    • https://site-1174077.mozfiles.com/files/1174077/simadatax.pdfIn PDF document text
    • https://cdn.sqhk.co/nomazotesi/VF5jjj5/tejumaj.pdfIn PDF document text
    • https://cdn.sqhk.co/lerapuraroke/ggGjduy/worimirolaf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530429/normal_5fe4e9e81aa9f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379220/normal_5ff979cf1b5d5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486346/normal_5fcbe2153cfa7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459180/normal_5fa7dad613bde.pdfIn PDF document text
    • https://site-1168267.mozfiles.com/files/1168267/buick_riviera_performance_parts.pdfIn PDF document text
    • https://cdn.sqhk.co/tixunudixa/guQBigs/bugawoguvojixesek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gijifosunusu.epizy.com/cisco_ise_license_ordering_guide.pdfIn PDF document text
    • http://feliruxitekul.epizy.com/85709742297.pdfIn PDF document text
    • http://diwuvugu.epizy.com/donation_certificate_appreciation_template.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_off0000e97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97F 5348 bytes
SHA-256: c463902295b9a3e66b9fd5cd359d05cf9408b580af60ed47b1a0a19060074b15
font_01_sfnt_off0000fbb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB5 10500 bytes
SHA-256: fd22a441356ec9a51d9bc4fe3360e612bce9bd7e2b8bcb17fdeb62831f3c6865

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