Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d8c9dd0fdfdc97a…

MALICIOUS

PDF

81.5 KB Created: 2021-04-04 04:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 6bce2bbb9a74580595fb0d49ec806178 SHA-1: ed75dab7abb5b0f98a65c4fc47b62f2861ca9635 SHA-256: 0d8c9dd0fdfdc97ad49362e21c1648efc14d1d7054d608803ad458d11099c13f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to link farms hosted on disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://druttle.ru/award?keyword=biochemistry+usmle+questions+pdf PDF link annotation
    • https://cdn.sqhk.co/dosakupu/9id8Rif/homemade_facial_masks_with_eggs_and_oatmeal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460963/normal_60160077f18b3.pdfIn PDF document text
    • http://vidclips.design/wigojipofadalojeniweyibdp.pdfIn PDF document text
    • https://cdn.sqhk.co/fagisuxupinu/mHCVIhc/goponaxirulapew.pdfIn PDF document text
    • http://thecet.xyz/vekomabedotatemi1c3d.pdfIn PDF document text
    • http://leafester.online/10th_class_mathematics_book_andhra_pradesh91r57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380883/normal_60586d18eaf02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378618/normal_6068d1a0f0f16.pdfIn PDF document text
    • http://healthytrands.com/bawakonavumawifj03k.pdfIn PDF document text
    • https://cdn.sqhk.co/mogujawogo/kGKCOMH/jetuguzorubesuwoba.pdfIn PDF document text
    • http://fortuneocredit.com/background_video_recorder_pro_apk_fulle7qp3.pdfIn PDF document text
    • https://cdn.sqhk.co/miloniwuwave/hfFtPgR/saxunopotuse.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bf9d615-61b1-4c50-83de-a00e8db58678/52180922713.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/gcse_edexcel_maths_paper_1_2019_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/what_is_an_example_of_a_biblical_allusion_in_beowulf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49c2d555-54a1-4fa3-a094-5807fda5ba12/kenmore_elite_vacuum_reviews.pdfIn PDF document text
    • https://69a21580-3c80-4f81-8097-1ec0bc18215d.filesusr.com/ugd/bd7df1_ceb7bb4571db4fa39007e37fcef54e1f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5dd3471-15dd-473b-990e-8013589c7023/snapper_xd_battery_powered_lawn_mower.pdfIn PDF document text
    • https://s3.amazonaws.com/latufenaw/bts_burn_the_stage_ep_5.pdfIn PDF document text
    • https://591e60e9-54e8-4b06-a9a7-f2e0522969d0.filesusr.com/ugd/1fd4b7_dbc0e78054744ac9b4171b04d7ba3d67.pdf?index=trueIn PDF document text
    • https://a1d1c4ac-cf1d-4c58-861c-45d1188f4b60.filesusr.com/ugd/052f3a_40e9db45e5d444449c49ceb288ed3796.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/amma_donga_songs_telugu_naa_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/flavours_of_youth_parents_guide.pdfIn PDF document text
    • https://80c8fd16-4cf8-4f9f-b52b-d6c956df8f3b.filesusr.com/ugd/1a94e8_7204c6a6c59946e0b31d9c7cfddd011f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bb9695a-b354-46ba-8d40-9d165d3368b5/samsung_grand_prime_battery_replacement.pdfIn PDF document text
    • https://196cdf53-7a38-4f80-8f5e-3ad65c24f50e.filesusr.com/ugd/e5a593_5b819122e42c43559639113591b63c94.pdf?index=trueIn 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_off000100af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AF 5460 bytes
SHA-256: aaaad257208308607816cc5cd0d366c7b2a70f9117d19f50b1b97c19e45d1eba
font_01_sfnt_off00011324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11324 10880 bytes
SHA-256: 37a6ca796afe7b0fbd24be867ba67a5bd061bb4ca81f39063950631808f8832b