Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c9bec91a42953e7…

MALICIOUS

PDF

81.5 KB Created: 2021-03-18 22:18:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8e48067efdcb95cd24028f1b0b35a49a SHA-1: 3cbe8e2d9204b91bf5602feec25d41178622f557 SHA-256: 4c9bec91a42953e7461b805d081abb250a125778061d08fc774d164310d5a499
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 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/123?utm_term=ls2208+datasheet+pdf PDF link annotation
    • http://stickerrus.ru/honda_fourtrax_300_4x4_service_manualbr9cs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379473/normal_60121c8a9355e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469643/normal_6022a69ca7a28.pdfIn PDF document text
    • https://cdn.sqhk.co/keridola/D20ShhD/80202065549.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411252/normal_5fd6b0ec5e375.pdfIn PDF document text
    • https://cdn.sqhk.co/rorefevobo/giIuEjg/fake_call_from_chucky_scary_doll_pranks.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417129/normal_5feba20ee1a73.pdfIn PDF document text
    • https://cdn.sqhk.co/wofunukasu/jhghugi/fake_pregnancy_test_report.pdfIn PDF document text
    • http://instapriz24.online/7272102142swzve.pdfIn PDF document text
    • http://springtea.space/are_monitor_power_cords_interchangeablecsic0.pdfIn PDF document text
    • http://vir-tus.com/donelipoziferenusifidilokgfsq2.pdfIn PDF document text
    • http://nyvelsets.online/economy_toeic_1000_rc_vol_5g0x8k.pdfIn PDF document text
    • https://cdn.sqhk.co/kexofodatop/0gghehj/ethnos_report_definition.pdfIn PDF document text
    • https://cdn.sqhk.co/vasozaponem/jfuieif/25492531200.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://153f2bed-3501-4ec5-9468-ed1987511f6d.filesusr.com/ugd/f67134_e8779f6786854e9dac542f28ac44c846.pdf?index=trueIn PDF document text
    • https://bf130ee1-1463-4c69-9604-1b23772ced92.filesusr.com/ugd/b4609a_a32eb2f13af748e1b614270322392b0a.pdf?index=trueIn PDF document text
    • https://02e0da19-eac5-4521-950b-4e410541bf1c.filesusr.com/ugd/516249_16253fb9a4b74dfbba52a406e4396185.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/how_to_calculate_volume_gallons.pdfIn PDF document text
    • https://d2ea4bfc-f92a-4379-acf2-d9b69981ddb7.filesusr.com/ugd/739437_d428b2259c614843bb6b6c2a8466b910.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/rodewa.pdfIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/calculus_basic_books.pdfIn PDF document text
    • https://d064ede3-316f-4d13-8ec5-014b2136b3bd.filesusr.com/ugd/154db6_372f359be298457f91f75f4b415c6de1.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADA 5408 bytes
SHA-256: b13ab107f4aae308d360173f0968198b5f761966f086b493c2265560667ddf02
font_01_sfnt_off0000fd46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD46 10984 bytes
SHA-256: 8077fc43bfe8145d82a1f004623f32509be53a5f27697a4886ef9a389b0e8a91
font_02_sfnt_off00012328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12328 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e