Malicious PDF — malware analysis report

Static analysis result for SHA-256 c73c7a1b02c6b999…

MALICIOUS

PDF

75.2 KB Created: 2021-04-10 11:42:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c3a8780872973cbd33476ff6c49a2aa7 SHA-1: 531e23c3dcf51d384b6274d3c23f76ff9ab074c5 SHA-256: c73c7a1b02c6b999e7dd84860ffbdc9c6388cdd58370b3aa9ab00ed8fe5bc354
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 0.9997

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://jumiwimov.ru/strik?utm_term=club+car+precedent+windshield+installation PDF link annotation
    • http://fegokodelaxen.scienceontheweb.net/jack_and_the_beanstalk_the_real_story_full_movie.pdfIn PDF document text
    • http://xolokeminapi.getenjoyment.net/21338551150.pdfIn PDF document text
    • http://slmit.space/52294118368vh9jb.pdfIn PDF document text
    • http://sugoxebojun.getenjoyment.net/54094853024.pdfIn PDF document text
    • http://kovamuwaropepu.getenjoyment.net/cantigas_de_santa_maria_music_score.pdfIn PDF document text
    • https://cdn.sqhk.co/labifikup/9ge0ihK/cricket_bowling_speed.pdfIn PDF document text
    • http://sayfelengs.space/aranjuez_adagio_guitar6lfms.pdfIn PDF document text
    • http://show-visitor.xyz/70224051637wvz8l.pdfIn PDF document text
    • http://shimano-stradic.ru/fogadonefipenegipuxozonig8e25.pdfIn PDF document text
    • https://cdn.sqhk.co/tajudozizif/gQUhac1/89785438349.pdfIn PDF document text
    • http://timecodes.net/levitu7em7d.pdfIn PDF document text
    • http://blekrossi.ru/nhc_thiu_nhi_xe_cnh_stdw8kg.pdfIn PDF document text
    • https://cdn.sqhk.co/bisulalu/ic3haDJ/fishing_life_hack_unlimited_money.pdfIn PDF document text
    • http://igcopyrightforhelps.com/29156613094nlds9.pdfIn PDF document text
    • http://bigno.space/what_is_the_best_way_to_mine_bitcoinwfttg.pdfIn PDF document text
    • https://cdn.sqhk.co/zutujodara/uFlhfig/banque_cantonale_neuchateloise_annual_report.pdfIn PDF document text
    • http://nuveclovet.xyz/pencil_sketches_cartoon8frws.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c3373aeb-ed74-4f2d-b631-fa679e0a3f6f.filesusr.com/ugd/cbe7f7_f8bf1c29831040cda47e1c2b5513dad0.pdf?index=trueIn PDF document text
    • https://6632aaff-1fe9-4f1d-acb3-7d444e457837.filesusr.com/ugd/ce4b7c_18fa10c6c787498b99530bc3e72f00c4.pdf?index=trueIn PDF document text
    • https://76bf42c0-7447-45ed-8dd3-33f9786ae3ae.filesusr.com/ugd/ba2c19_b5803f90f6454e79bc68e18265d9107d.pdf?index=trueIn PDF document text
    • https://44879a12-c10a-431c-a98a-7de142752d0f.filesusr.com/ugd/bb4607_b244d7dd6902475cab2f717d3afdecb9.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94F 5296 bytes
SHA-256: 348148e4653106ce8314f8b8043408e047c3aab72fe2d784a666884d9e32cff9
font_01_sfnt_off0000fb4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4E 11004 bytes
SHA-256: b3471554b234a6a243670dab864c95d7f62a37adc77f04f307216539236b81ee

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