Malicious PDF — malware analysis report

Static analysis result for SHA-256 6243b494e94fcddf…

MALICIOUS

PDF

76.1 KB Created: 2021-04-05 08:22:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0edc62d0ddbbf1798cdfe04fd5fd98b8 SHA-1: 7a0c8b8791b05ad78b531e050746322119ea1d52 SHA-256: 6243b494e94fcddfda7f214bcf76be094fb36be7a26f51edc06ab58364fa07b7
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://pelibifir.ru/wix?keyword=colinde+de+craciun+download+albume PDF link annotation
    • http://stopnutristrike.ru/xemapap15933.pdfIn PDF document text
    • https://cdn.sqhk.co/biwizalibe/hids08L/zavulexeronofene.pdfIn PDF document text
    • http://wogamilip.iblogger.org/totedosewotujiluzuf.pdfIn PDF document text
    • http://dapajurop.mygamesonline.org/64433975912.pdfIn PDF document text
    • https://cdn.sqhk.co/zovaratigu/icDhejg/shelters_near_me_for_men.pdfIn PDF document text
    • http://nakanilo.club/xujibeine4v.pdfIn PDF document text
    • http://static-get.top/65487712028nkrub.pdfIn PDF document text
    • https://cdn.sqhk.co/suxupijisajo/fFhj9ib/zejekowaponufu.pdfIn PDF document text
    • https://cdn.sqhk.co/zogowefu/phghd81/grass_cutter_robot_diy.pdfIn PDF document text
    • http://bamefidev.mygamesonline.org/caucasian_chalk_circle_synopsis.pdfIn PDF document text
    • http://on-arenas.com/zumazlau0u.pdfIn PDF document text
    • http://saxosoxajivovud.medianewsonline.com/82172213965.pdfIn PDF document text
    • https://cdn.sqhk.co/mivadunoxo/yHEu4hi/loneribenukemegidoxupor.pdfIn PDF document text
    • http://xavesusefowale.mywebcommunity.org/arabesques_debussy.pdfIn PDF document text
    • http://farozemirig.scienceontheweb.net/21041822120.pdfIn PDF document text
    • https://cdn.sqhk.co/midipumep/hebiDgi/kuwadejevurazuvekox.pdfIn PDF document text
    • https://cdn.sqhk.co/xawobovuji/gehcjhm/xalimorujegegef.pdfIn PDF document text
    • https://cdn.sqhk.co/topedimerab/DMegeT8/55664698788.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xarigezosuwa.rf.gd/93809796510.pdfIn PDF document text
    • http://rosajeku.myartsonline.com/zasapokunobi.pdfIn PDF document text
    • http://gofapebilim.rf.gd/exercises_for_groin_strain.pdfIn PDF document text
    • http://lusajafimaneru.myartsonline.com/unit_6_geometric_proof_answers.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE25 5044 bytes
SHA-256: 7bff3434b8ea1d644d96652e7b40fad08ed1c9f8988d14aa36372ef8a7601156
font_01_sfnt_off0000ff3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3E 10264 bytes
SHA-256: 747344f5192aac74e212c1b16672b216f24a3adc569e3f05adbf31e87c76c810

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