Malicious PDF — malware analysis report

Static analysis result for SHA-256 143de52ac599800b…

MALICIOUS

PDF

75.6 KB Created: 2021-03-20 00:35:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a38ec9842f83de426ec9c1caa7844c78 SHA-1: b0af216b07309d568cf89317f484b3e29e5246b6 SHA-256: 143de52ac599800b91f647714e95cb257d32a5393de6aa46289096e6a6b7fcdd
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. One prominent URL, 'https://bologen.ru/strik?utm_term=serato+dj+pro+2.3+5+32+bit+download', indicates a potential lure for software downloads. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/strik?utm_term=serato+dj+pro+2.3+5+32+bit+download PDF link annotation
    • http://tonedomopoja.scienceontheweb.net/barfu_am_klavier_piano_sheet.pdfIn PDF document text
    • https://cdn.sqhk.co/guranotup/iIDicyb/pang_adventures_review.pdfIn PDF document text
    • http://sorifaj.22web.org/lista_swek_angielskich_b2.pdfIn PDF document text
    • https://cdn.sqhk.co/fopujetoros/wheVheb/best_mirrorless_camera_deals.pdfIn PDF document text
    • http://fuvidevifa.scienceontheweb.net/vokiravotijodojo.pdfIn PDF document text
    • https://cdn.sqhk.co/fiwojosop/2S2Isih/asian_jurassic_park.pdfIn PDF document text
    • https://cdn.sqhk.co/kigoxeni/1FhajcQ/loxiruzoxafepof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wenares.myartsonline.com/netgear_wnr3500lv2_firmware.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b43652d-5c48-46d4-bb00-c1991644a09f/how_much_should_a_miniature_dachshund_eat.pdfIn PDF document text
    • http://ruvedinaz.rf.gd/85666015585.pdfIn PDF document text
    • http://gufolisalowu.rf.gd/honda_eu7000is_eu7000_generator_service_repair_shop_manual.pdfIn PDF document text
    • https://0503187d-52cd-4237-9521-a3cb9bf551ae.filesusr.com/ugd/5bb01c_0d8d97f21bdc42f9b0bb276a7a34cff8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/74d425f3-7d1f-4358-810b-cf6bfde9bce0/que_enfermedades_califican_como_discapacidad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6cc42dd-187d-4c79-be14-b0c19277404d/life_comes_from_life_theory.pdfIn PDF document text
    • http://belibivizonojo.myartsonline.com/best_online_project_management_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8abeedb3-e9e9-468f-8328-5c4736a8cbc3/vicks_cool_air_humidifier_instructions.pdfIn PDF document text
    • https://7c9e9c40-2b96-4f88-8065-b5ff5e495659.filesusr.com/ugd/3bfcae_d8151927498e4ead8a0267291256ef05.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/20ac7813-a19e-4f8e-b800-88203d720a0e/constitucion_politica_de_los_estados_unidos_mexicanos_1857.pdfIn PDF document text
    • https://32e47638-7206-44c1-ad53-5c6f9176402e.filesusr.com/ugd/e00742_2e7ba288713843279c723578a9abf581.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/96a2820d-c43d-401a-89b0-4854db52af15/wekufebaf.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_off0000ddb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB9 5640 bytes
SHA-256: 28d7dcb8cc2d5f08d1d5f67de45a12a1980f147efacf7aea7ecc29cf22252d44
font_01_sfnt_off0000f114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF114 20964 bytes
SHA-256: 8850d705ec1ac146943d4cc3c88ea7aae5e0e1689f5ff8c6ad324ce77816612e