Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ec9569398038557…

MALICIOUS

PDF

78.2 KB Created: 2021-03-18 07:12:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a339b87a96be8b4f024d54bf74f01c5d SHA-1: 41dcbe670d39beba6f0ec47136cb80ac209a694b SHA-256: 7ec956939803855700e0f84269a26e94f1b14f7e64b39c64ab24fe0da3670482
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for phishing or distributing further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/123?utm_term=oura+ring+sizing+guide
    • https://cdn-cms.f-static.net/uploads/4458848/normal_600d30a1680a7.pdf
    • http://bonboxstudio.com/2725148676u6zrh.pdf
    • https://cdn.sqhk.co/dowusutitozi/ihmG0YL/real_car_parking_2_pc_indir.pdf
    • https://cdn.sqhk.co/tetolonul/JDjbSqs/dedonorexatupofugaxikotas.pdf
    • http://resimpub.com/xunelipogoresemelufarer7wdt5.pdf
    • https://cdn.sqhk.co/fexonawizoz/theVifK/aesop_rock_labor_days.pdf
    • https://cdn.sqhk.co/pulovafafita/lfgh6BN/70798933076.pdf
    • http://prequester.online/809516093318iqg0.pdf
    • http://sevastopol.sale/sunewusufojozuvexogr00n.pdf
    • https://cdn.sqhk.co/dibitarebizu/3ayDsih/best_dawnblade_pvp_build_2019.pdf
    • https://cdn.sqhk.co/mewuxedodi/gfUeged/aea_online_learning_sign_in.pdf
    • http://astrology-personal.online/twisted_road_insurancexqy45.pdf
    • https://cdn.sqhk.co/kibutonap/8LhgaRu/bullet_echo_para_pc.pdf
    • https://cdn-cms.f-static.net/uploads/4365652/normal_5fdc6ee42bf43.pdf
    • https://cdn.sqhk.co/nalawanuxa/hd0jhaf/tusifirifelep.pdf
    • http://teaitalis.space/vobebojemxxyo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_8f29c2bdb2f14d3a8a46119929bf3555.pdf?index=true
    • https://a5fc3680-5c08-4cda-bd6c-abaa3bdf25bc.filesusr.com/ugd/ea5d7b_920c962f405f43ad8ee8e45abff7f868.pdf?index=true
    • https://d33b8dfc-9792-4d26-9d81-613d0bd32a71.filesusr.com/ugd/d34367_c2d820a63d6b4e2d9d31cec51d4cd191.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6b8.bin
b7c6951ec90573aa7b6ba1d6738234faf55881836bf77b6d9389c72b7f7b197c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B8 5040 bytes
font_01_sfnt_off000107eb.bin
a86d9bddb8ee0b2a99abe82bc3250a257a787ae333c3f6ca4acc68afb03013b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107EB 10420 bytes

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