Malicious PDF — malware analysis report

Static analysis result for SHA-256 55372fcbaddfb139…

MALICIOUS

PDF

74.4 KB Created: 2021-04-21 22:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 858dc93bdda8fd0eba9924d6f1ad5e35 SHA-1: 125c773615274d14062c6afdae010476fb444f18 SHA-256: 55372fcbaddfb13922db122e257a01f8ae36df02f10b24da3de1f2bf39a00872
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://pelibifir.ru/strik?utm_term=how+to+hook+up+dish+remote+to+roku+tv PDF link annotation
    • https://cdn.sqhk.co/nisikevepoxi/ionUajd/purisugi.pdfIn PDF document text
    • https://cdn.sqhk.co/vixawutozama/RS4gijj/f1_mobile_racing_download_mod_apk.pdfIn PDF document text
    • http://netlysy.online/12807876128ee03g.pdfIn PDF document text
    • http://construt.site/nerimevojikiduwikixif2cq4m.pdfIn PDF document text
    • https://cdn.sqhk.co/xawowatu/hbmjaia/kexaxuturebolowudubiwawa.pdfIn PDF document text
    • http://polibesafonujof.iblogger.org/ranijepoligavonani.pdfIn PDF document text
    • http://smotrikino.fun/powikiwavok72tyn.pdfIn PDF document text
    • http://slimerecipe.org/78594840186pzxt7.pdfIn PDF document text
    • http://pipazodonuwadu.iblogger.org/descendants_3_book_report.pdfIn PDF document text
    • https://cdn.sqhk.co/wujamufaw/giifTFK/marooned_on_an_island.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/taguxif/veletodeju.pdfIn PDF document text
    • https://b7af6bb9-01eb-4839-ab56-764651de4344.filesusr.com/ugd/2486b5_0fdc8f24b79c4f5b9af8c9f2841f2f4a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zoluwivebiro/psicologia_anormal_libro.pdfIn PDF document text
    • http://dataluwemijelo.epizy.com/breach_of_trust.pdfIn PDF document text
    • https://cd70d4e5-4a1a-4071-96d1-f2415ea5ece1.filesusr.com/ugd/7f46b5_45e77deec8564a14a465384e8aa90997.pdf?index=trueIn PDF document text
    • http://sakodaletop.rf.gd/71271332415.pdfIn PDF document text
    • http://ximigatoma.rf.gd/effects_of_noise_in_communication_process.pdfIn PDF document text
    • https://7be326e9-a1fd-4761-a84c-83c904220737.filesusr.com/ugd/37e945_82fadf8eb59a454bb84f6b23fa432090.pdf?index=trueIn PDF document text
    • http://jivuwenidupilu.rf.gd/mofotozi.pdfIn PDF document text
    • https://69868269-04aa-4a0d-8379-1371762fd556.filesusr.com/ugd/d8beff_00164b8c77744a7299c9a1d5096c9135.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/banose.pdfIn PDF document text
    • http://wagesasalep.rf.gd/carbon_cycle_process.pdfIn PDF document text
    • https://1cd0d4d5-11d4-440c-a307-81f73801f601.filesusr.com/ugd/f0e51d_4bcfa3a99f384edea1f5aad9ac4a17fa.pdf?index=trueIn 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_off0000e581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE581 5132 bytes
SHA-256: 5e5b8799035ca35c782ad8b2bf3ac9dee867d89ad2478112e7d4ccbf63d78e33
font_01_sfnt_off0000f6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E3 10944 bytes
SHA-256: 3ee87e1ac71e3241c44e67cb2b52e53f43fd8a4bd92300f29dcd029342e2bfa7

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