Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0cac7b9a9b5920c…

MALICIOUS

PDF

91.7 KB Created: 2021-04-07 08:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 5a39992c49678a5c887f51e21b765a8a SHA-1: 21760b2ad5859c0e3b68298f721490e38fc7648f SHA-256: c0cac7b9a9b5920c6128bd90054f39014bff630381f924ed3a054b69b87cbf66
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document contains numerous embedded URLs, many pointing to disposable hosting and acting as a link farm, which is a common technique for distributing phishing content or second-stage malware. The presence of external URIs and the 'link farm' heuristic strongly suggest an intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://midufefew.ru/strik?utm_term=behind+closed+doors+lyrics+pharoahe+monch PDF link annotation
    • https://cdn.sqhk.co/letareximo/e7Bidic/24252678633.pdfIn PDF document text
    • http://cabinetshub.xyz/lego_harry_potter_1-4_hogwarts_castle_gold_bricksh2way.pdfIn PDF document text
    • http://sosed.market/842005517ejbz0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500200/normal_5fca682fcd833.pdfIn PDF document text
    • http://meriline.store/eheim_auto_feeder_instructionskov8q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471703/normal_6018d1f220e3e.pdfIn PDF document text
    • https://cdn.sqhk.co/vozevadijut/7gdhSjL/ninja_turtles_legends_mod_apk_1._11._39.pdfIn PDF document text
    • http://cashtanks.fun/how_to_hook_up_a_float_switch_to_a_pumpf7sdh.pdfIn PDF document text
    • https://cdn.sqhk.co/fagaxirupunu/nXzhdjf/mafia_hero_idle_tycoon_wiki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478123/normal_606ce26c273c3.pdfIn PDF document text
    • http://nafigunagofadab.getenjoyment.net/cascade_control_loop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377414/normal_5fc7c1422aec5.pdfIn PDF document text
    • http://sudilufib.getenjoyment.net/45471809852.pdfIn PDF document text
    • http://azalea.store/putisumde8d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://387a498e-9551-4239-9507-3183ba214552.filesusr.com/ugd/cd403b_2f15129fe05a4bf1bd3b67a69a851e82.pdf?index=trueIn PDF document text
    • https://6f8cb219-4830-455d-9ced-b55e65700e85.filesusr.com/ugd/fd30ac_d1c58557182142b1b7336c50787b8da0.pdf?index=trueIn PDF document text
    • https://56db2a4d-09ce-4ff6-a558-abb1d6727cd4.filesusr.com/ugd/003b86_b3951e28d40c4030a80f4d3d0ceba6a6.pdf?index=trueIn PDF document text
    • https://0f285ee0-1b14-49a2-8a3e-060a2db94812.filesusr.com/ugd/4bf67f_0a6a6fc0560149a4a57ad8cac9375450.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DB 14212 bytes
SHA-256: 368319b9a50113ef156f2f3dd3bf2aae3d18ea7abc3bbab054624bada8dda3f1
font_01_sfnt_off00011398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11398 5464 bytes
SHA-256: 3e31b77f6fd7bd82354e4e47d8363315be5c459416e3f60864a28452e2176c9d
font_02_sfnt_off0001260e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1260E 10964 bytes
SHA-256: f515466ed046cfbc31bbe852a22e99566bebe72409ac70da49c89f814f0f65fd
font_03_sfnt_off00014bc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BC9 16160 bytes
SHA-256: 71fec8a3adfe41455811528c654ef740a0d97889ddd19e39e153b04b7507b7f0

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