Malicious PDF — malware analysis report

Static analysis result for SHA-256 f75a24b8b27464d6…

MALICIOUS

PDF

74.3 KB Created: 2021-04-06 06:42:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: dd01841047ac13cb357006ebcee2bf3a SHA-1: 3f145a3b3a332aa947a33aec934e1d8b3c1ebe25 SHA-256: f75a24b8b27464d68b3c5dc872e66ccf876817c0be750cf6d0ce59e838d5a427
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable domains, indicating a link farm designed to redirect users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to exploit users through deceptive content.

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://pelibifir.ru/123?utm_term=bb5+best+dongle+crack+free PDF link annotation
    • http://sis-paypal.com/audio_recorder_and_editor_app53mxd.pdfIn PDF document text
    • http://afracheat8.xyz/komudekufegebajavetuujo8x.pdfIn PDF document text
    • https://molujeridinu.weebly.com/uploads/1/3/4/4/134400438/ruzizinesuritimopar.pdfIn PDF document text
    • https://jegetujo.weebly.com/uploads/1/3/5/3/135300600/4363418.pdfIn PDF document text
    • http://beststudent.fun/libijewugevasudup1hixz.pdfIn PDF document text
    • https://tumurotijom.weebly.com/uploads/1/3/4/5/134512141/miladusit.pdfIn PDF document text
    • http://shopwithsale.website/satewebazimoniw4pji.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://degeluvugo.rf.gd/dizexeboliwejusat.pdfIn PDF document text
    • https://s3.amazonaws.com/mosezavor/demographic_composition_of_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21213bf1-403b-498c-9bfd-92b71db29694/jotuvazute.pdfIn PDF document text
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_6b9a06c356284505953fd74b86d446dc.pdf?index=trueIn PDF document text
    • https://0df6220b-9630-4647-aab6-0d9db69b9d59.filesusr.com/ugd/8b97dd_7fdc4b699331406ab3f84a8111d3aa3e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wovisak/71121693665.pdfIn PDF document text
    • http://titaleze.rf.gd/words_that_start_with_short_u.pdfIn PDF document text
    • http://zuzimekot.rf.gd/luliwiporemimegokolo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77a08050-133f-442e-a9f5-b5f1dd66f5d8/vopuxej.pdfIn PDF document text
    • https://s3.amazonaws.com/dexodekelaseki/porsche_family_owns_vw.pdfIn PDF document text
    • https://27420876-d215-4860-9a72-f48db0d0c320.filesusr.com/ugd/4062c2_834d875a421442129863006a8115085b.pdf?index=trueIn PDF document text
    • http://gixopesibesuges.epizy.com/duguduxapiguluzigobe.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_off0000e3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FD 5564 bytes
SHA-256: 96b5c9765ea041b27bd8196b7c86586c22bb7394289f2b9e53bfe92225230d7c
font_01_sfnt_off0000f6f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F9 10992 bytes
SHA-256: 069d0354953467eb439a1df38d9181652fcd891191a579ca5d7833878e7e405c

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