Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bc73940f6366882…

MALICIOUS

PDF

68.5 KB Created: 2021-03-24 06:39:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 8855f7f39a9e0582eb6d38abbba977a2 SHA-1: 84cf8cd012c2793e3684a32e73ddf203fb9064d2 SHA-256: 3bc73940f6366882a588352398ac32733dae70aa9f2a9cad4c377172226078d2
184 Risk Score

Malware Insights

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

The sample is a PDF file flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The embedded URL `https://crophysi.ru/award?keyword=yamaha+banshee+350+service+manual+pdf` is identified as a malicious redirector. The PDF also exhibits characteristics of a link farm on disposable hosting, suggesting a phishing or spamming campaign. No scripts were extracted, but the presence of malicious links strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/award?keyword=yamaha+banshee+350+service+manual+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4466996/normal_601dc37b376fd.pdfIn PDF document text
    • https://cdn.sqhk.co/bipokagiti/ibGIfft/official_bundesliga_fantasy_manager.pdfIn PDF document text
    • https://cdn.sqhk.co/pifixijowoka/uCWTaig/multi_hand_video_poker_strategy.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/bissell_powerforce_compact_turbo_2690_belt.pdfIn PDF document text
    • http://gemubanabugawa.mypressonline.com/cuanto_es_120_gramos_de_mantequilla_en_cucharadas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480753/normal_6006e35e33e7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490256/normal_6010a88c8b068.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/6hdigjb/calligraphy_fonts_free_marathi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417318/normal_5fcd46162cb0d.pdfIn PDF document text
    • http://woxuruko.medianewsonline.com/berlin_route_map.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417659/normal_6026edd9f192f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412573/normal_6056ac210ed35.pdfIn PDF document text
    • https://cdn.sqhk.co/rilepama/kdmkjvG/cavernous_malformation_brain_gene.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413866/normal_5fe4609423cc0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://460eb545-5389-4aa9-9e78-d1074a8bca0c.filesusr.com/ugd/21a131_44fc9bc98803429487b5be795305c403.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/af610816-07ea-4ef2-9b02-c14a23dd0299/what_not_to_write_in_a_personal_statement_medical_school.pdfIn PDF document text
    • http://pabizex.atwebpages.com/atticus_finch_closing_argument.pdfIn PDF document text
    • https://5e0c4d4d-41f9-428c-9564-b93e7cff6769.filesusr.com/ugd/510691_d14d0518d4524e5083dc56817a1a59f8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/07b214ed-62c9-43d9-8fc7-49a3045ce39b/bic_america_formula_f12_subwoofer_review.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_off0000cc3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3F 5984 bytes
SHA-256: 007d09ccf81b9b25efc7d46532fdfd171b4e68dd811f288843955317d6abf76a
font_01_sfnt_off0000e078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE078 10104 bytes
SHA-256: 5958ed32533b48637c4a21f08ed39f668e006199dd8f714e4b90314a278b4033