Malicious PDF — malware analysis report

Static analysis result for SHA-256 a22d170e498f4a41…

MALICIOUS

PDF

81.4 KB Created: 2021-03-28 12:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 0cbc52597a954bcad1cc94e3110f3785 SHA-1: ebc11b0e63a1b2bd96e3b915aa12ae24db6d0658 SHA-256: a22d170e498f4a41c31cb7eb0db504c63fa54b2d118c3813508dc3256aa32790
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, indicating a high likelihood of malicious intent. It contains numerous external URIs, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate that the document's primary purpose is to redirect users to potentially harmful websites for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/123?utm_term=appsc+group+2+syllabus+pdf+2018 PDF link annotation
    • http://lotupojaxuvutix.mygamesonline.org/moruvosaterusi.pdfIn PDF document text
    • http://bumawusuka.mypressonline.com/what_is_on_an_autopsy_report.pdfIn PDF document text
    • https://cdn.sqhk.co/nozedimasav/MjgFihC/68530075183.pdfIn PDF document text
    • https://sezulozag.weebly.com/uploads/1/3/0/9/130969806/xenanokuk.pdfIn PDF document text
    • https://cdn.sqhk.co/tavikebepo/ibjighr/23428841743.pdfIn PDF document text
    • http://zumanidoxup.medianewsonline.com/45471334042.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424645/normal_6009edaa6c6bf.pdfIn PDF document text
    • http://metoxegid.mygamesonline.org/9471662493.pdfIn PDF document text
    • https://cdn.sqhk.co/toxodimina/iaPITwM/41791147266.pdfIn PDF document text
    • https://vumukawa.weebly.com/uploads/1/3/4/6/134662430/nipumenolalejovalafe.pdfIn PDF document text
    • http://mumijivamivaxij.medianewsonline.com/romeo_and_juliet_questions_and_answers_quizlet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469350/normal_6038f2258951d.pdfIn PDF document text
    • http://feremujidonigu.getenjoyment.net/sonutajesoxujakowuzeniraz.pdfIn PDF document text
    • http://pifovabu.getenjoyment.net/breeam_new_construction_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481675/normal_5fd657d00a451.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/2b37ff19-b4cb-4371-a267-39bd134cdfe1/what_is_a_physical_network_in_computer_science.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36d829e9-b70b-4621-9f77-3c39e33f4ff9/vumigiraxabareb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/908477d5-3d9d-49f1-b2eb-8317a7f0f3ac/curious_george_books_read_aloud.pdfIn PDF document text
    • http://sidepojedava.myartsonline.com/get_ielts_band_9_grammar_secrets.pdfIn PDF document text
    • http://raxegujanamefas.atwebpages.com/tigazanopav.pdfIn PDF document text
    • http://vovojoj.atwebpages.com/administrative_law_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70bcf571-029c-444f-adaa-8f18a2ef873a/80118419966.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_off0000fda2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA2 6072 bytes
SHA-256: 709e7b701a396b3eb2bad9753bd9c00f93b02d581ff2430d68e80f4fd91b0d6d
font_01_sfnt_off00011262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11262 11296 bytes
SHA-256: b2a304c6dad73e2c79348fb3ea5c4889035c65d9e6d706296c0397a34601f9f9

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