Malicious PDF — malware analysis report

Static analysis result for SHA-256 677483f03ea652dd…

MALICIOUS

PDF

70.1 KB Created: 2021-03-17 04:45:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 5d3ad72744454e084a490d22ed6054a0 SHA-1: ec1842907dd727c57867e27976c69bb0afc08f11 SHA-256: 677483f03ea652dd668bb6e69aaba7a88992d44382c741d780e034aa9e17a0fd
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 or trojan. It contains numerous embedded URLs, including one pointing to 'zajinet.ru' which is associated with a keyword search, suggesting a phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, further supporting a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/wix?keyword=laboratory+equipment+and+uses+worksheet PDF link annotation
    • http://rolopigabetitu.scienceontheweb.net/architects_mumbai_list.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467003/normal_600e75e71fcc0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497658/normal_6008781ff3b8e.pdfIn PDF document text
    • http://nutetuxiv.mygamesonline.org/22428482708.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374364/normal_6049a2745f330.pdfIn PDF document text
    • http://manamuposa.getenjoyment.net/how_to_become_a_software_development_engineer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412379/normal_600b034c26330.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391620/normal_6029cc80f3938.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404103/normal_5ff9b33611636.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529893/normal_605119a200c14.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/xeruxaxer/49567324067.pdfIn PDF document text
    • http://bitujiduruv.myartsonline.com/abiotic_synthesis_of_organic_monomers_and_polymers.pdfIn PDF document text
    • http://winukuso.epizy.com/wd_my_passport_vs_elements.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5229cbdc-cb1e-4ef8-9d44-2c249f63bf76/in_search_of_our_mothers_gardens.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99c8f908-f598-4a99-9ff1-81fce1b184e5/33137302450.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63ba787e-9369-418b-a7e9-15b0ba1c8317/newagigaxitiperijufit.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/can_you_play_fallout_new_vegas_on_xbox_one.pdfIn PDF document text
    • http://sekudevabadim.rf.gd/how_to_achieve_progression_goals.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_off0000d581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD581 5632 bytes
SHA-256: 876725424e1c0b8a0adebb9db8d3b8032c1319b9780eebdbe4d1741c884b69b2
font_01_sfnt_off0000e88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88D 10228 bytes
SHA-256: 38b98d448368398cc0e728e1bdc571066582599a907f0b45c4a8e2d8193e47a4

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