Malicious PDF — malware analysis report

Static analysis result for SHA-256 beed5447db519ed7…

MALICIOUS

PDF

102.1 KB Created: 2021-03-24 04:28:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19273ad2c9b162feca19b42af7d4ff34 SHA-1: d8574816a44d442c43ed1d6c6713e8db8e98e3e6 SHA-256: beed5447db519ed774a8225dc85654daac12858d934bf5d2e62e4ab7fbe62e79
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are SEO-optimized and lead to other PDF files, suggesting a link farm or phishing attempt. The primary URL, 'https://maypoin.ru/wix?keyword=warhammer+40k+books+pdf+free+download', is presented as a search result to trick users into downloading more content. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/wix?keyword=warhammer+40k+books+pdf+free+download
    • https://cdn.sqhk.co/moviferu/jbJgjja/free_klondike_solitaire_card_games_download.pdf
    • https://cdn.sqhk.co/zigotimuti/VzZAfhi/whispers_of_a_machine_gameplay.pdf
    • https://cdn.sqhk.co/muwizavo/W8Nihjc/45730357720.pdf
    • https://cdn.sqhk.co/bumigorawi/hfjiBfe/57439433000.pdf
    • http://kixesisero.22web.org/binaural_beats_alpha_beta_theta_delta.pdf
    • http://xudisoda.66ghz.com/rosigife.pdf
    • https://cdn.sqhk.co/tinolefowi/d3jeExB/draw_a_stickman_epic_free_no_download.pdf
    • https://cdn.sqhk.co/zifeduwa/jgidxWy/super_tanks_llc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://bd15da75-ee01-4ad3-8b22-4778d9929f37.filesusr.com/ugd/1abc29_2edc7d915e3d4ef6a034d75b72b26b9b.pdf?index=true
    • https://8fa10226-37c2-454d-bd65-ced70ecbf0c4.filesusr.com/ugd/c34aa9_f7e60de5bb6841238648acdb2523f286.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3bedb8e0-e8ef-4ab7-8b06-b8ccf544bb48/56985138279.pdf
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_25f41de9f36c4c82815bffcb6dc18d65.pdf?index=true
    • https://04a9e765-cf69-4035-9b9a-998d8fb4e692.filesusr.com/ugd/8c5016_dae6a4bf09af439da761abb9e955b018.pdf?index=true
    • https://badbb018-ab4e-499b-b788-960949b82e3d.filesusr.com/ugd/4f4c56_15ed67dd496b47c18c43cea3664b736a.pdf?index=true
    • https://aca292c6-a3ee-4c96-b4c9-db15c8eca1b9.filesusr.com/ugd/cd1d52_289c082004774c9fa77b9400f7570a80.pdf?index=true
    • https://52ed6390-a5c1-4502-9f93-599cf6d98ad1.filesusr.com/ugd/f7fbc8_40113b49273f4097a27efbcce9ec061d.pdf?index=true
    • https://7c3dd69e-6649-485e-b385-36acc2971cd6.filesusr.com/ugd/cf9ff1_a086ba44f48e446f8bd2cfd05c249dfa.pdf?index=true
    • https://1f49b3f1-4b09-4f89-88df-03804352fc9a.filesusr.com/ugd/a51aec_a26c99c1d38c4724ad1af309528c5b4f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/931d08b7-2db9-4876-9138-a39a3f861dd0/what_is_a_llc_for_dummies.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001504d.bin
1d6c704dd7e46835a6993d16d4d422e053b641647a64b726d099ddc9ec71772f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1504D 5820 bytes
font_01_sfnt_off0001640b.bin
fa69c7fd9cfada4b99a793dfdfe684b3d7f43573f8110fd34254d8b583cbc5b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1640B 11592 bytes

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