Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f400ab7f10e31f…

MALICIOUS

PDF

87.7 KB Created: 2021-03-14 03:45:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5aea2fa7103bc418766923aa22bcfa5f SHA-1: 756d8ed8d0e5093d6552e4364605e74a65f0f4c3 SHA-256: 16f400ab7f10e31f3b3f77ec2b41cef44d54724de020e435cb659bfbdb84d4ac
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with a significant number pointing to a link farm designed for SEO manipulation, suggesting a phishing or malware distribution scheme. The primary malicious URL identified is https://seumenha.ru/wix?keyword=dragon+rising+skyrim, which likely serves as the initial lure or payload delivery point.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/wix?keyword=dragon+rising+skyrim
    • https://cdn.sqhk.co/fekesolip/egdhg9m/kepidew.pdf
    • https://cdn.sqhk.co/zizenozi/0Jjjic6/94941044419.pdf
    • https://cdn-cms.f-static.net/uploads/4483337/normal_6045c53d9ab7f.pdf
    • https://static.s123-cdn-static.com/uploads/4388183/normal_5ff800bf60eb5.pdf
    • https://cdn.sqhk.co/nebafori/jkghmih/world_hockey_championship_2019_live_scores.pdf
    • https://cdn.sqhk.co/tamurikubol/hjigj7i/history_of_dark_ages.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8d6920c1-aef5-45ed-b1a0-e693d63948fb.filesusr.com/ugd/0a593f_49ff9333ca7b4a629937ae106be3ec14.pdf?index=true
    • https://s3.amazonaws.com/rujimidujek/candombl_bem_explicado_gratis.pdf
    • https://cc67bef4-e22e-42fd-bf01-3f02b15f800b.filesusr.com/ugd/080020_c05ee6a7ad0842a08a88a80013c9a3dc.pdf?index=true
    • https://61249681-e2d1-4375-841a-b3723294d79c.filesusr.com/ugd/3d514e_b9888abe71874ba6a78af7a26e5db1fb.pdf?index=true
    • https://s3.amazonaws.com/penale/billie_eilish_ocean_eyes_astronomyy_remix.pdf
    • https://uploads.strikinglycdn.com/files/6348818f-83dd-4b7d-a66f-10f51377e0e6/how_to_write_computer_code_for_dummies.pdf
    • https://9ef77391-fdd1-48d8-ba15-364b07375333.filesusr.com/ugd/ebefdf_42326124d4c844b18ec7f44241d7491b.pdf?index=true
    • https://c18d9829-3add-4afa-bc87-35007fe3998a.filesusr.com/ugd/70c1ec_4b41762e130f44358c04eaa64d6f5196.pdf?index=true
    • https://uploads.strikinglycdn.com/files/56028151-dfb5-444c-be1c-9a693abb4c06/73053864901.pdf
    • https://uploads.strikinglycdn.com/files/6a1c9ba8-b779-41ca-a76b-ffe742224fac/pubebarufo.pdf
    • https://4647adb0-9c01-46a1-aef1-4380d5873f13.filesusr.com/ugd/edb4a7_a6326b66e8f64ba995f43d77aabf148b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/92ff651f-a1fa-43f2-89b9-2e7f35f566ca/gijupuxigodene.pdf
    • https://s3.amazonaws.com/sazixipame/public_finance_notes_kenya.pdf
    • https://d5fd0048-bb8d-45a1-ba21-28d1cb0b7162.filesusr.com/ugd/5e8de6_360fabcd7a9940d792552d538e4a3d7e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d25a60a7-38e5-44c2-a336-4505bf7bedc5/used_ariens_riding_lawn_mower_parts.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_off0001181e.bin
3844901cfd1c6f8dba9c498f7863798e67903121a1056486fc8572ba48ca0fbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1181E 5136 bytes
font_01_sfnt_off00012997.bin
6323e89ff7cb30bf83502a15a839359141bb35555c78fa4eb4acc759dd5bf6ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12997 12840 bytes

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