Malicious PDF — malware analysis report

Static analysis result for SHA-256 042cadbb5abd95c2…

MALICIOUS

PDF

79.1 KB Created: 2021-03-24 17:53:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: f9332711569ea84a045260750eaaaa87 SHA-1: f68f7a665cd502aa7230383153cc316565f6dec7 SHA-256: 042cadbb5abd95c204d03afea483ff33df1382761474337917ba19273858245a
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with the primary one being 'https://lozipotod.ru/strik?utm_term=how+to+set+hd-1688+clock', suggesting a lure to a malicious site. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://lozipotod.ru/strik?utm_term=how+to+set+hd-1688+clock PDF link annotation
    • http://mailedflkf.site/73927780848y9338.pdfIn PDF document text
    • https://cdn.sqhk.co/nekuripafi/ghiblhe/14608458739.pdfIn PDF document text
    • https://cdn.sqhk.co/devepogisog/iKohcLx/lefuvumit.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/iV2pZjj/34227219494.pdfIn PDF document text
    • https://cdn.sqhk.co/wotinobeb/j6RhgmI/celcom_reload_to_other_number.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopiroxab/wjhhe7Q/meditation_marcus_aurelius.pdfIn PDF document text
    • http://saxefitipar.iblogger.org/9575409318.pdfIn PDF document text
    • https://cdn.sqhk.co/pafevola/hbjjJXI/wedding_cake_designs_near_me.pdfIn PDF document text
    • http://the-job.ru/blender_3d_projects83g1y.pdfIn PDF document text
    • https://cdn.sqhk.co/xawobovuji/jUhjia4/duck_life_4_space_hacked.pdfIn PDF document text
    • https://cdn.sqhk.co/mekurapiw/hbghheA/verizon_visa_gift_card_status.pdfIn PDF document text
    • http://lightsex.ru/how_do_i_access_apple_books_on_my_computer83bpc.pdfIn PDF document text
    • http://infokurs.design/20579835978fn56f.pdfIn PDF document text
    • http://ylyn.ru/derivatives_of_trig_functions_worksheet_with_solutionsphth7.pdfIn PDF document text
    • https://cdn.sqhk.co/mujowofapubi/o0Aijia/20367587122.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/9b7e0054-b32c-4b3b-ace8-b713428889f4/29399040506.pdfIn PDF document text
    • http://xamudakosenezi.rf.gd/trips_risk_assessment_army_form.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/former_chairman_en_francais.pdfIn PDF document text
    • http://dobejevilorizu.epizy.com/medicare_guidelines_for_axumin_pet_scan.pdfIn PDF document text
    • http://denuvifateve.epizy.com/25_gramos_de_azucar_a_mililitros_son.pdfIn PDF document text
    • https://s3.amazonaws.com/debiwelof/gurufolojisabut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f15a883-5c7d-4090-b135-a7ac6e005464/how_to_troubleshoot_a_frigidaire_freezer.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/fezitemiwabim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ba97ac2-25ee-44c1-a924-72bac0327c65/purud.pdfIn PDF document text
    • http://pevoxino.epizy.com/adt_dsc_power_832_user_manual.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_off0000f5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D1 5268 bytes
SHA-256: bac9936bb94645d0799424c29448bfed0b4b0a677ede2acee9faa323ffb1bae7
font_01_sfnt_off000107e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E0 11044 bytes
SHA-256: d5426189d7c3b5a53b58c726447baf88703495d96ac763b928cd8ec1a6aee6a8