Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad39bdc10b472c7b…

MALICIOUS

PDF

83.4 KB Created: 2021-05-05 16:13:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 64968ea247a2723691ed5fb9c73431af SHA-1: 7b7e91f5cd5e3ff0aae1fc20991616d4b3fe9f65 SHA-256: ad39bdc10b472c7bad7207271ac2263959791650aa034f174c3b4aa69cb9b439
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with one specifically pointing to a URL associated with phishing. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, further suggesting malicious intent. The ML classifier and ClamAV detection strongly indicate this PDF is malicious, likely serving as a lure for phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://midufefew.ru/strik?utm_term=learning+photoshop+cs6+step+by+step+pdf PDF link annotation
    • https://cdn.sqhk.co/nejisakatok/hhdtGgj/hask_hair_hollywood_picture_quiz.pdfIn PDF document text
    • https://cdn.sqhk.co/bitaxukezor/bgjgkhc/8929563164.pdfIn PDF document text
    • http://xofelivigavas.mywebcommunity.org/skin_cancer_information.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419827/normal_6021a675c2e39.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417037/normal_5fdff9a486192.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408188/normal_601be4b2e5473.pdfIn PDF document text
    • https://cdn.sqhk.co/livejizilul/jgmhaif/answers_for_interview_questions_admin.pdfIn PDF document text
    • http://zomolejefej.mywebcommunity.org/gukogegivofuliguranape.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468827/normal_603633096b1f6.pdfIn PDF document text
    • http://jonebukusopovet.mygamesonline.org/comparative_advantage_and_opportunity_cost.pdfIn PDF document text
    • http://majusenise.sportsontheweb.net/pipexulenuzuvatila.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxafopagad/aDsyhaZ/stick_warriors_super_dragon_fight_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/gujowaxexag/QG8Thby/4583416525.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408180/normal_601d68bfa1b67.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://palibam.atwebpages.com/62183794069.pdfIn PDF document text
    • https://ab737b70-891a-4a1f-8db9-ee548211cb31.filesusr.com/ugd/ce14f3_dec41eb93acd4a839ba73ce77fcc388c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/debiwelof/31507787973.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/dodge_avenger_2013_engine_swap.pdfIn PDF document text
    • http://gakilasefit.myartsonline.com/46989774707.pdfIn PDF document text
    • http://jomopizemiz.onlinewebshop.net/17554528813.pdfIn PDF document text
    • https://e1eccfe9-8888-4f52-a155-e9c8e84e0752.filesusr.com/ugd/4fb05f_8305a941ecf14f19a6d8b3d4c5b2a510.pdf?index=trueIn PDF document text
    • https://3d3b31fc-6152-41c7-b1d4-a4af3afcce63.filesusr.com/ugd/3f8d85_e638ee45828845f8b8d3c888f51baf62.pdf?index=trueIn PDF document text
    • https://36ba0bd5-485c-4bd5-924f-6a5e18dcb854.filesusr.com/ugd/96419b_675a064597534682bc7a128bd7f51ba4.pdf?index=trueIn PDF document text
    • http://womawujun.atwebpages.com/psychic_intelligence_book.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_off0001051e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051E 5724 bytes
SHA-256: 1b974e9f3b8cf7284afa30d376ce91a6f4e9ba5c5d8fbe845748ef61af0f082c
font_01_sfnt_off00011899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11899 10960 bytes
SHA-256: d1f6ee69b7f223718f32f65ecb6f51f5bb5caf7c21b1a20d42f06c7735667d3c

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