Malicious PDF — malware analysis report

Static analysis result for SHA-256 f25b856c32400c1b…

MALICIOUS

PDF

75.0 KB Created: 2021-04-01 00:15:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2113059c42350481abe260ac789f0d3a SHA-1: 9448a6df8439c074311f5c73e826c2ca330e1e0b SHA-256: f25b856c32400c1b6336a9db38aa22dc8031aa8b36a924dd18132552ce43551e
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one specifically advertising 'free gift card codes no survey'. This strongly suggests a phishing or scam attempt designed to drive traffic to malicious websites. The ML classifier and ClamAV detection further confirm its malicious nature, likely as a phishing lure or a downloader for further malicious content.

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://leonvi.ru/wix?keyword=free+gift+card+codes+no+survey
    • https://nirejabepifu.weebly.com/uploads/1/3/4/2/134266024/mavobonite.pdf
    • https://cdn.sqhk.co/pubodegosog/ihCV0ge/nepivuzinuxo.pdf
    • https://gefaturulabi.weebly.com/uploads/1/3/4/4/134487578/dedoditujonelu_fadevama_goxatifinuk_zorarizagiwo.pdf
    • https://cdn.sqhk.co/karadirimose/jI5Bknj/gusej.pdf
    • http://favanitum.iblogger.org/5476762791.pdf
    • https://kevulukopefot.weebly.com/uploads/1/3/1/4/131453006/7250152.pdf
    • https://taroxeme.weebly.com/uploads/1/3/4/3/134358537/e83972de0538b6.pdf
    • https://cdn.sqhk.co/sevijeruba/ggcjc6Z/bolopozawira.pdf
    • http://xujimutisep.iblogger.org/gugodofidu.pdf
    • http://reweder.site/my_favorite_things_sheet_music_pianoa9ima.pdf
    • http://sportita.fun/32468728008v38hs.pdf
    • https://rubajamepufukav.weebly.com/uploads/1/3/4/4/134432722/fawas-koguwuliwaruk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wuzuferopo.epizy.com/fire_extinguisher_use_worksheet.pdf
    • http://xesapekaf.epizy.com/management_information_systems_managing_the_digital_firm_sixteenth_edition.pdf
    • https://e43fc0f2-02a2-45a6-a3bb-97f011a0d611.filesusr.com/ugd/451461_96e1a51f190244ecaffd4cb9f170c5aa.pdf?index=true
    • https://901c4554-6fda-40bf-8344-1f1538f5dc06.filesusr.com/ugd/a76634_a193034e8a78482ebde146bb3bcf3acf.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_off0000e7f3.bin
972caf0e9fa4d628b760c49151db7e8cc77efd0f214f984c4f20ef1bb8001402
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F3 5272 bytes
font_01_sfnt_off0000fa0c.bin
ca8a16f5bd8ba47de6d595c15b853f5be086de05bdaef92e09a6426e3e7dd393
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0C 10860 bytes