Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2fdbd30f8097249…

MALICIOUS

PDF

92.6 KB Created: 2021-03-01 00:22:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 1846888b29000ad61b66a07e7edf8664 SHA-1: b3e4811347ddd39bc301e6f3c71e1bd6e9af05ff SHA-256: c2fdbd30f8097249279fdb59768515d162f323895b3c7005cf40562645622427
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically pointing to 'kuzutuzo.ru', suggesting it may be used for phishing or to redirect users to malicious content. The PDF structure and embedded URLs are consistent with a phishing lure, potentially disguised as a 'General's handbook'. No scripts were extracted, but the presence of multiple external links is a strong indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/wix?keyword=general%2527s+handbook+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375704/normal_600ad6883bf62.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393181/normal_5fcd3ae349e90.pdfIn PDF document text
    • http://xonigej.mypressonline.com/levexidor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413375/normal_5fe8e176edea7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485296/normal_60178c8cdb839.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445550/normal_5fec761a947cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477892/normal_5fdf245caaf4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367960/normal_6030d444b2976.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530846/normal_603b4e4d4ad02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389601/normal_6029490aac5f6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366327/normal_600801395d5fa.pdfIn PDF document text
    • http://toxipoxekej.medianewsonline.com/business_communication_today_10th_edition_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406464/normal_5fe63bc1bc53e.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/mejifavo/api_testing_using_postman_for_beginners.pdfIn PDF document text
    • http://doriponesarom.myartsonline.com/1868021268.pdfIn PDF document text
    • https://s3.amazonaws.com/tezude/44844561512.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/belabub.pdfIn PDF document text
    • http://jalijoruki.atwebpages.com/how_many_carbs_in_burger_king_medium_onion_rings.pdfIn PDF document text
    • https://s3.amazonaws.com/sefabe/bhaiya_tamil_movie_audio_songs.pdfIn PDF document text
    • http://zudupaxub.myartsonline.com/rocket_stove_combustion_chamber_design.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_off00012d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D6E 5396 bytes
SHA-256: 379543b635ca95168c85fa0822bfa84ab5dc15db7c9223e939cf7fe44b73837c
font_01_sfnt_off00013fbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FBF 10940 bytes
SHA-256: 5de78d5362fb0ba635b855895e049bb8b420c20104b8a7d8fbfbc5375782c01c

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