Malicious PDF — malware analysis report

Static analysis result for SHA-256 c38f68d05f8cd1e0…

MALICIOUS

PDF

76.8 KB Created: 2021-05-03 18:41:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 1d2a6582170e7b28372ad477eeee4b10 SHA-1: 58d9e1a4c07918fc1736f880cf1609748553eca0 SHA-256: c38f68d05f8cd1e0a9032455e75a4fd47e6ffd7eb0fac1b5092fdba4b4099992
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics, including ClamAV and an ML classifier, indicating a phishing or trojan threat. The document contains a link farm designed to redirect users to other PDF files, with one primary URL pointing to a suspicious domain. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest an attempt to distribute further malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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=the+throne+of+fire+graphic+novel+pdf+download PDF link annotation
    • https://cdn.sqhk.co/gufezitaxato/jjEEDjf/stick_run_2.pdfIn PDF document text
    • https://cdn.sqhk.co/zimajigon/shjieD2/64528160174.pdfIn PDF document text
    • https://cdn.sqhk.co/zivuzigup/mFjaji5/99399107641.pdfIn PDF document text
    • https://cdn.sqhk.co/sofizagumup/ljhxgdE/gitavuk.pdfIn PDF document text
    • https://cdn.sqhk.co/xovujiroveg/UidPhdZ/38172259268.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/b9efbc6d-4e39-493a-980c-2d5858750335/tugemiburul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c5f7aed-04a5-4dad-8477-80a50442e3fd/65763460179.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a5915ff-82a0-4890-a5ce-1544ce1c0109/4946688550.pdfIn PDF document text
    • https://c9107794-7b31-4e5c-84de-5db174abdfaa.filesusr.com/ugd/aabf5f_8b69295c8e3e4dfebfc1d37d3003a6a5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef39b47f-25ee-4087-82aa-e2e7ee27a895/allergen_menu_el_pollo_loco.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/caaffc89-634f-4a71-a86b-003490a5c282/will_a_man_test_you.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/382699d3-e4da-4957-8bef-3661d766c643/60098293727.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0da8e81-d6d6-4d77-bb64-b7b640962242/62837942891.pdfIn PDF document text
    • https://c216880a-03a2-4774-ab7e-121c93799e8f.filesusr.com/ugd/b5aed9_bf44ab47466d44d7a1a64a768f20363d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5967ce37-e331-4d7d-9bc2-194f1d1a56ab/how_to_deactivate_deep_freeze_with_password.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/570a2812-831f-4a64-b157-fd8c8535b38c/mixidinu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53faf6fd-6b1d-4dbe-b400-35da0684d1f8/super_mario_land_game_boy_retro_games.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4937f2e7-2208-47ad-9c0b-5a125c466e6d/67252917834.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7966fe30-8672-4e04-a03c-bbfb47760eb2/95434923515.pdfIn PDF document text
    • https://6184de0c-c318-42a7-882e-c5ddc63b817d.filesusr.com/ugd/1c8c1e_5f8df05cdb864adead0121a910fb338f.pdf?index=trueIn 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_off0000ee1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1A 5340 bytes
SHA-256: 2d1a0e14ec043b97ae90d5be3438c3492843314afb259c62a8307e7efe481d36
font_01_sfnt_off00010057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10057 10788 bytes
SHA-256: bd9652caae84b9a299ddc94e9ce84f52935a090fdb7daf484e7d7249146d9795

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