Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dae5bba31555b04…

MALICIOUS

PDF

74.3 KB Created: 2021-04-06 10:31:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12fba3409e2c5895f5153ccbae8e2199 SHA-1: 569ee6ac1c609fa6b489fc246cc0903e0e925371 SHA-256: 9dae5bba31555b04e763e6faa4ab60d282b1fb24cbcd7bc2a61cfc88f963b68e
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting a link farm or phishing attempt. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document is designed to redirect users to malicious sites, potentially for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/wix?keyword=xbox+360+user+manual+pdf
    • https://fabuduviwanor.weebly.com/uploads/1/3/4/7/134739750/6854912.pdf
    • https://cdn.sqhk.co/vexapalas/digkgfB/97275277156.pdf
    • https://vamewifajezik.weebly.com/uploads/1/3/5/2/135297159/fad1753f7c.pdf
    • https://cdn.sqhk.co/tezofugowura/dxqOicS/how_to_write_reversible_reaction_symbol_in_word.pdf
    • https://cdn.sqhk.co/ponajadu/pge7heG/wadanaladobigu.pdf
    • https://cdn.sqhk.co/bulelovuroga/4qhak48/retoxirokiwibipizinevel.pdf
    • https://cdn.sqhk.co/fusaduxuw/UghZghN/samsung_galaxy_s20_ultra_5g_ringtone_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/fc613df0-e1d5-4f89-b798-81d4daa981e3/wuwixokepino.pdf
    • https://uploads.strikinglycdn.com/files/053097b6-a044-4c06-b289-cf173703b6a0/how_to_setup_netgear_3700.pdf
    • https://uploads.strikinglycdn.com/files/e0fc23a7-b34d-4cb4-87de-540fc1748be3/inverse_log_ti_89_titanium.pdf
    • http://bolutiso.epizy.com/9191316718.pdf
    • https://uploads.strikinglycdn.com/files/8d1261d1-0f04-40d6-9139-c3cb4b5dd54c/rovifaxezudenetavojamakan.pdf
    • http://kamegil.epizy.com/84647388167.pdf
    • https://uploads.strikinglycdn.com/files/304d9a7b-2294-4451-bfb5-a173f16fe9d5/53116683398.pdf
    • https://uploads.strikinglycdn.com/files/a77f4e07-265c-483c-87a7-e85042a15ca2/a_long_walk_to_water_discussion_questions_by_chapter.pdf
    • https://uploads.strikinglycdn.com/files/812013c5-2c12-4e0c-908a-9cd73c89bb15/tinopivo.pdf
    • https://uploads.strikinglycdn.com/files/60bded83-ac84-4a7d-8d0d-57547857dedb/how_much_does_it_cost_to_replace_a_honda_civic_hybrid_battery.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_off0000e425.bin
d7867b7b52c9e4739c3993d557f320feb355e5ada1bca7878a7f7380e5b4894d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE425 5832 bytes
font_01_sfnt_off0000f7e3.bin
68c22da3c2d3ad4dc41a3e8deb248ff2f68090a8d8eec6f3ffcbded27ef72a64		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E3 10672 bytes

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