Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb3a4d142f4141bd…

MALICIOUS

PDF

63.6 KB Created: 2020-12-24 12:43:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 8f6271a5e960b1b116ce0df7f0e01569 SHA-1: 3e08b34aa6f3ebd7d9298cd0e0c710e9db4166f6 SHA-256: bb3a4d142f4141bd8bab8309e934516e2d1edb023b9bbd2c4d965bbf7c749dd0
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which point to SEO-optimized PDF documents, suggesting a link farm or SEO poisoning tactic. One prominent link, 'https://trafffe.ru/strik?utm_term=free+throw+line+dunk', is identified as an SEO redirector, likely leading to a phishing or malware site. The ClamAV detection and ML classifier further support its malicious nature, indicating it's a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7713

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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=free+throw+line+dunk PDF link annotation
    • https://finubakexa.weebly.com/uploads/1/3/1/3/131383318/985cc119f3c273b.pdfIn PDF document text
    • https://kojepogezoxuta.weebly.com/uploads/1/3/4/4/134487575/a3ca795ab0.pdfIn PDF document text
    • https://mudagetani.weebly.com/uploads/1/3/4/3/134381332/nejijozijoxuwax.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dobikasukavu/40837243790.pdfIn PDF document text
    • https://s3.amazonaws.com/boxalewijim/node_google-_spreadsheet_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/xenexiselavekalegisoj.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/evil_within_2_bosses_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/backup_android_messages_and_contacts_to_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/the_trenches_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/origem_da_vida_biognese_e_abiognese.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60be7048-bd08-4090-8d80-424a6ac44779/el_fin_de_la_infancia.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/adobe_printer_instance.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/constraintlayout_barrier_vs_guideline.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawe/moseduzotol.pdfIn 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_off0000cb03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB03 4636 bytes
SHA-256: b26e6acdc934f84ecd0654c9a3519e57153d2855387f67e2481f74b0b8ce5d5f
font_01_sfnt_off0000daca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACA 4692 bytes
SHA-256: 5d03e977f6f909b1952a043ecfb8615d2dd45524e744b83c5ee46068327841d0

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