Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fcb7b95819a8051…

MALICIOUS

PDF

67.2 KB Created: 2021-04-02 22:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: faf9985d397f8f2f46910f17d1081f77 SHA-1: 5107c1ea24a3d1b114e3c3bd588e953cecd921e6 SHA-256: 8fcb7b95819a8051ea9e72f1e99f58ee2af09c8aacdbd0ca770fc2bcd0181154
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one pointing to a suspicious domain ('soxebez.ru') that is likely used for SEO manipulation or phishing. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan. The presence of embedded URLs and the PDF structure strongly suggest an attempt to redirect users to malicious content.

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://soxebez.ru/wix?keyword=schwartz+plumbing+and+heating+bluffton+indiana
    • https://cdn.sqhk.co/bajipugotox/rhdgcoI/crashing_season_4_cast_90_day_fiance.pdf
    • https://cdn.sqhk.co/xedaberetaj/riaicqv/69348054402.pdf
    • https://cdn-cms.f-static.net/uploads/4379970/normal_603110100e79c.pdf
    • https://cdn.sqhk.co/veletafi/cgdDjfD/take_off_the_flight_simulator_pc_gameplay.pdf
    • https://cdn.sqhk.co/juselivo/ijig5hc/super_miner_grow_miner.pdf
    • https://cdn.sqhk.co/lilaxikixo/NvjhgfY/hack_piggy_boom_apk_download.pdf
    • https://static.s123-cdn-static.com/uploads/4417814/normal_5ffdece211e4c.pdf
    • https://cdn.sqhk.co/pidodalatip/glNhfgh/24909971457.pdf
    • https://cdn.sqhk.co/mudemodox/adVjaif/modern_combat_3_fallen_nation_apk.pdf
    • https://cdn-cms.f-static.net/uploads/4423696/normal_60208c9b82e13.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a0d97d01-7a11-45c7-a404-0b92bca859d1/social_studies_definition_in_hindi.pdf
    • https://uploads.strikinglycdn.com/files/99b552d4-049b-43ef-bdf1-6e94530439b2/82169488044.pdf
    • http://gebogozomusedom.rf.gd/linanugetited.pdf
    • https://uploads.strikinglycdn.com/files/ffd8deda-5d67-4b91-bd81-b06bb66213eb/45693730704.pdf
    • https://538d8494-0c7d-401a-b890-0485f6bc7bca.filesusr.com/ugd/29c71c_16239334a74a4860b8dc3e6a6bba0e18.pdf?index=true
    • http://punejiva.epizy.com/employee_provident_fund_form_11.pdf
    • https://49550882-97ce-44db-a38b-6e383bb81149.filesusr.com/ugd/062c90_471f60ba63964f3b9ee6fe22f09e067e.pdf?index=true
    • 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_off0000c712.bin
e8458323384fe59ce5d981f07b2d40d1903c8ee723338754059fc86753303a6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC712 5776 bytes
font_01_sfnt_off0000dab3.bin
41a3f6d95b80689a01e44f51ec95fd4f60e7e7b8da528fb2019268695bc6b2d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB3 11144 bytes

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