Malicious PDF — malware analysis report

Static analysis result for SHA-256 1317f67961b2baec…

MALICIOUS

PDF

79.7 KB Created: 2021-03-29 03:08:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38fe2509c2806b7037359c1b49d6dcab SHA-1: 3a5a81a3e53fbed745aa0acfe1495fc09cc6eed5 SHA-256: 1317f67961b2baecb9348329b09c01261243db49a0d47f1966d64a57a2b787b6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files hosted on file-sharing services, indicative of a link farm or SEO poisoning tactic. The heuristic PDF_SEO_LINK_FARM and the ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware distribution sites. While no scripts were explicitly extracted, the PDF structure and external link farm suggest it's designed to exploit user trust by mimicking search results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/strik?utm_term=should+high+school+diploma+be+capitalized
    • https://ralerafuzirepob.weebly.com/uploads/1/3/4/3/134386916/1237808.pdf
    • https://tazugusalasuxof.weebly.com/uploads/1/3/4/5/134581133/nexolojekinasa.pdf
    • https://bevikafu.weebly.com/uploads/1/3/4/7/134710030/df32cd7712.pdf
    • https://bokozadag.weebly.com/uploads/1/3/0/9/130969835/suxulujonofew.pdf
    • https://lefojokux.weebly.com/uploads/1/3/5/3/135399193/xetuvumupenejufoje.pdf
    • https://fiwisito.weebly.com/uploads/1/3/4/7/134715438/sunutedufono.pdf
    • https://jerexibim.weebly.com/uploads/1/3/4/6/134654770/44335d9538c82b1.pdf
    • https://pejupatuwotim.weebly.com/uploads/1/3/2/8/132814375/rejetosudigener.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://8a833fea-7c9a-4d2e-a5a7-d3590f42a3e5.filesusr.com/ugd/9aab09_95428b2c19fb4c23bf17f2927d597635.pdf?index=true
    • https://s3.amazonaws.com/ropuba/rofurovomokojopabatu.pdf
    • https://a9d1d3ec-13fa-4b7e-abe1-abe2c2ba1301.filesusr.com/ugd/f83029_781e0d4da943476da1118d1823a14a04.pdf?index=true
    • https://s3.amazonaws.com/rizijubovapuk/xatepowinikalodujeba.pdf
    • https://s3.amazonaws.com/nimuwet/mozibudid.pdf
    • https://s3.amazonaws.com/zulezov/bohemian_rhapsody_piano_notes.pdf
    • https://s3.amazonaws.com/tutasujal/co_ownership_agreements_templates.pdf
    • https://s3.amazonaws.com/pasawexawinogad/morning_alarm_ringtones.pdf
    • https://7722bba5-72ad-4d15-a72d-9ce9fbdcf1b5.filesusr.com/ugd/772ad5_ebe857682c204a2fbd37e7774af0ec16.pdf?index=true
    • https://s3.amazonaws.com/dowesitobuga/oracle_database_security_audit_checklist.pdf
    • https://uploads.strikinglycdn.com/files/4ff6ae6b-983b-4e0d-9b01-9ba21cda661f/83560029234.pdf
    • https://s3.amazonaws.com/zidosozawok/exercice_barycentre_corrig.pdf
    • https://uploads.strikinglycdn.com/files/44a67ed8-9bb7-4d06-9554-460ff97fc0a5/78272738103.pdf
    • https://s3.amazonaws.com/saziwijaxodav/gukisajukewewowugu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb6d.bin
46cbeb6a7ca8de9598a9cf07ecbac7f13a9ff51eee0112b7022792e067e61198		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6D 5460 bytes
font_01_sfnt_off0000fe06.bin
b8b948c21d5b891e29b6780aadc8ae3db0ab5ec2522a0df4cd4fefe704881afb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE06 10972 bytes
font_02_sfnt_off00012349.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12349 4324 bytes

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