Malicious PDF — malware analysis report

Static analysis result for SHA-256 70b76fca402f4a44…

MALICIOUS

PDF

77.0 KB Created: 2021-04-22 10:36:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d23bc527e0f9d4eb77c5b6b8b3eb8b73 SHA-1: 2b0e8ec29cfcf37ba231a6bad0d03a5a62ca7581 SHA-256: 70b76fca402f4a443aad322605e5b2ff0a59d2c707e027c69c01ca4f2cd13137
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary focus on 'https://gimoguvi.ru/strik?utm_term=attack+on+titan+game', suggesting a phishing or malware distribution lure. Heuristics indicate it's a link farm on disposable hosting, and ClamAV detection confirms it as 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, contains references to 'Attack on titan game' and the authoring application, reinforcing the lure. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://gimoguvi.ru/strik?utm_term=attack+on+titan+game PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4389127/normal_6055115f3d368.pdfIn PDF document text
    • https://cdn.sqhk.co/bipobulif/hWqbMX4/10369356983.pdfIn PDF document text
    • https://cdn.sqhk.co/sovanoniwuva/fKiaDvC/tunixofubixomibafoputofu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380682/normal_60184cdabb7b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443602/normal_5fdaad3968584.pdfIn PDF document text
    • http://zukoretevir.medianewsonline.com/disney_jazz_piano_sheet_music.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445731/normal_6006167ad6b73.pdfIn PDF document text
    • https://cdn.sqhk.co/kosojilufut/ifcTgg5/javascript_tutorial_free_full.pdfIn PDF document text
    • http://gegebafebofad.scienceontheweb.net/wugakubanajubezeniperu.pdfIn PDF document text
    • https://nozijuga.weebly.com/uploads/1/3/4/6/134698325/8738335.pdfIn PDF document text
    • https://cdn.sqhk.co/votawusebak/JqjcKjd/apk_pomelo_fashion.pdfIn PDF document text
    • https://cdn.sqhk.co/nadoranur/gfEvqbG/2366634362.pdfIn PDF document text
    • https://guditeni.weebly.com/uploads/1/3/4/5/134529862/jonuxagim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375352/normal_600888bbb1d8b.pdfIn PDF document text
    • https://litalegikuga.weebly.com/uploads/1/3/4/5/134587653/2c35091.pdfIn PDF document text
    • https://senemoribut.weebly.com/uploads/1/3/4/7/134703027/5830862.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vavijirodujozi.rf.gd/ncert_maths_book_for_class_8.pdfIn PDF document text
    • http://zijubeda.rf.gd/pretty_green_polo_size_guide.pdfIn PDF document text
    • http://biborufa.epizy.com/migagedezafifonovumove.pdfIn PDF document text
    • http://nokefibazapowem.rf.gd/latest_development_in_science_and_technology.pdfIn PDF document text
    • http://texakotinize.rf.gd/html5_bangla_book_free_download.pdfIn PDF document text
    • http://xanedemu.onlinewebshop.net/battlestar_galactica_starship_battles_rules.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_off0000f1bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BB 4864 bytes
SHA-256: 52a486e96012001102ffcb00a13b9bab21a4aacf5d814958df1b9b99fb076b22
font_01_sfnt_off00010242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10242 10784 bytes
SHA-256: 1d702d7becd2896a68c892e05c644909db743ba263fd2e1223a3ba5d277bbc90

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