Malicious PDF — malware analysis report

Static analysis result for SHA-256 760823ebd8c32711…

MALICIOUS

PDF

74.2 KB Created: 2021-03-03 18:36:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 163f9207fcfae2edbcd8ee66b5d9d2d8 SHA-1: eb208b208abdcc3a203ccb7c88714a320947f3c9 SHA-256: 760823ebd8c32711f73f65569ad2c252cba179a1b66383a937416cc4b0092cff
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to disposable hosting or link farms, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though partially corrupted, contains keywords related to legal matters, likely used as a lure to encourage users to click on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://xajibur.ru/strik?utm_term=how+to+calculate+alimony+and+child+support PDF link annotation
    • http://daimontimur.org/9606019555956769.pdfIn PDF document text
    • http://lologunaw.mygamesonline.org/13334354087.pdfIn PDF document text
    • http://lajodibibodi.getenjoyment.net/how_to_check_chainsaw_chain_size.pdfIn PDF document text
    • https://fefumuvujudadi.weebly.com/uploads/1/3/1/6/131606087/94a89e5.pdfIn PDF document text
    • https://cdn.sqhk.co/tabuguran/QHCije4/tabletop_water_feature_pumps.pdfIn PDF document text
    • https://zoparimunafixi.weebly.com/uploads/1/3/4/3/134336740/1c553473c317b7.pdfIn PDF document text
    • https://cdn.sqhk.co/vedimurami/fidZ5ic/swepco_contact_phone_number_pay_bill.pdfIn PDF document text
    • http://pagavopalubutu.scienceontheweb.net/how_to_buy_otc_market_stocks.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408703/normal_60175a30c393a.pdfIn PDF document text
    • http://myluckywin.site/winter_sand_and_water_table_idease7arf.pdfIn PDF document text
    • https://cdn.sqhk.co/nidaruzada/cMjJGja/8672072404.pdfIn PDF document text
    • https://fakerotukipi.weebly.com/uploads/1/3/4/3/134376647/pasilelipizaxotolo.pdfIn PDF document text
    • https://gegoviboz.weebly.com/uploads/1/3/4/8/134876631/nakak_fixonasigawemon_tamobiku.pdfIn PDF document text
    • https://cdn.sqhk.co/futevanu/kgfjbge/ms_pac_man_game_boy_rom.pdfIn PDF document text
    • https://cdn.sqhk.co/tefozakozup/gg5mUjj/pametukujifonezujunilereg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503987/normal_5fd5f89d350cd.pdfIn PDF document text
    • https://kodiridit.weebly.com/uploads/1/3/5/3/135342100/c2c6a018.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pedamodaw.onlinewebshop.net/quadratic_equation_factoring_word_problems.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_off0000e65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65F 5468 bytes
SHA-256: 4aabbb81f3b5ed1a837d66e22d3405ae8a16c997934ae9d2a241206fe9d543ac
font_01_sfnt_off0000f8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E3 10208 bytes
SHA-256: c0a40714ec4f36fda9aa855e1fd08e3743a921b751ad8cf6f53b06efa3d28d2d

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