Malicious PDF — malware analysis report

Static analysis result for SHA-256 a934cdd597a94f06…

MALICIOUS

PDF

83.1 KB Created: 2021-03-28 17:30:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ae360cfcab3948766841d187954dfd25 SHA-1: 7cf79710a523aff8186f716658518fc822c245c8 SHA-256: a934cdd597a94f06fbabcde31452a992dc06672a2e1a6f292ea5f3cf83d3502e
126 Risk Score

Malware Insights

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

The file is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, with one pointing to 'zajinet.ru', suggesting a phishing or malware distribution attempt. The PDF structure and embedded links indicate it's designed to redirect users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://zajinet.ru/strik?utm_term=delta+22-540+planer+blades PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407749/normal_603e7be42235e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414864/normal_601c9d071a326.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379848/normal_604ccc06b7069.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422620/normal_602e2f8199ee9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458837/normal_5ff940f583af5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372399/normal_600a543d68cde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385876/normal_5fd10f270205e.pdfIn PDF document text
    • http://rozewevojalel.sportsontheweb.net/the_hunger_games_2012_full_movie_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486193/normal_605caabc4d510.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454048/normal_6023fc09efb63.pdfIn PDF document text
    • http://rowowevu.mypressonline.com/craftsman_3000_psi_pressure_washer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466135/normal_5fc6bc1be64f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392661/normal_6059269d2420f.pdfIn PDF document text
    • http://wifunagidoli.mypressonline.com/resevu.pdfIn PDF document text
    • http://ribavid.medianewsonline.com/pwm_inverter.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374373/normal_603a5e2b700ed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417040/normal_5ff0cdbec2a43.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lerezazo/3d_studio_max_2014.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/boxukasi.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/zetixarilonaxidasope.pdfIn PDF document text
    • http://bopisumeku.atwebpages.com/haripath_marathi_book_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/best_gaming_wallpapers_4k.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/android_one_mi_a2_rom.pdfIn PDF document text
    • https://s3.amazonaws.com/gazivemon/gikapulapixozomox.pdfIn PDF document text
    • https://s3.amazonaws.com/rodakarugupoko/benyamin_si_biang_kerok.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/nato_alphabet_g.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_off000105c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C9 5612 bytes
SHA-256: 7e4e4b9369f27364f28d635aa52583766405d2f3315facd31236c80255b85250
font_01_sfnt_off000118f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F6 10636 bytes
SHA-256: 9ea34fcfd440d1ac4dc3f083ee06794de6e243e6671795795e02c865138139eb

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