Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbe5139448b199f3…

MALICIOUS

PDF

80.8 KB Created: 2021-03-02 12:49:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 65c87a7094346b1c9672b1db87434e4d SHA-1: 81c3ac00b38d8af14b27a650f3354139fa30316e SHA-256: cbe5139448b199f3d6d5cb2e61ed3a0b58268702db82f1d8babc982e6bcaad8f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded URLs suggests an attempt to redirect the user to malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/wix?keyword=wotlk+mage+aoe+leveling+guide PDF link annotation
    • http://rafupofamurawaf.mygamesonline.org/fibitifavaxi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465702/normal_603544a678fc4.pdfIn PDF document text
    • http://makamar.tech/adolescentes_tetonas_chupando_polla16gae.pdfIn PDF document text
    • https://vonufire.weebly.com/uploads/1/3/4/5/134596457/1485220.pdfIn PDF document text
    • http://pedaxofanor.mywebcommunity.org/easi_joist_price_list.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459028/normal_5fd7bb44c0d4c.pdfIn PDF document text
    • http://segway-wheelchair.ru/xojafozenewuve5bj16.pdfIn PDF document text
    • http://wapividazofar.scienceontheweb.net/cien_aos_de_soledad_resumen_corto_yahoo.pdfIn PDF document text
    • http://zugemenelil.medianewsonline.com/bafirota.pdfIn PDF document text
    • https://nariwezug.weebly.com/uploads/1/3/1/4/131482968/fikagowatepa_budenilumofexut_nijoruj.pdfIn PDF document text
    • http://tijudozi.scienceontheweb.net/1_4_de_metro_es_igual_a_cuantos_centimetros.pdfIn PDF document text
    • http://kowojolajamuv.getenjoyment.net/kuwasidax.pdfIn PDF document text
    • http://mujabelor.mywebcommunity.org/fegunaj.pdfIn PDF document text
    • http://nageramuvepom.mywebcommunity.org/how_fast_can_a_rzr_170_go.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://satawakerexe.atwebpages.com/how_to_cook_a_brined_turkey_in_an_electric_roaster.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A4 4892 bytes
SHA-256: e5f951c422aa46cca44a19bf4db77e18a772de57a9ba7fb682dfad920bb57322
font_01_sfnt_off00010442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10442 10520 bytes
SHA-256: 6d14b39b326ffe4560cc7a08b55391db47deb2d862416379336448d7ef60e6e2
font_02_sfnt_off00012844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12844 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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