Malicious PDF — malware analysis report

Static analysis result for SHA-256 a51e9fc29a1ead2d…

MALICIOUS

PDF

96.5 KB Created: 2021-03-23 09:58:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 446b85fa1746bc744b1b9a2afdd48b0f SHA-1: dbdfbbf6c2b195e066686741fae3d238f990fb51 SHA-256: a51e9fc29a1ead2d6c393c8bdb2e67bddf5e52c6163b236187b0a9ca8335e45a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized, indicating a link farm designed to attract traffic. One prominent URL, 'https://seumenha.ru/strik?utm_term=delta+9+band+saw+for+sale', is directly associated with a heuristic firing for external URIs. The presence of a PDF_SEO_LINK_FARM heuristic and a high ML score strongly suggests a malicious intent, likely phishing or malware delivery, despite the absence of executable scripts.

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-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/strik?utm_term=delta+9+band+saw+for+sale
    • https://static.s123-cdn-static.com/uploads/4425924/normal_5fdde03fcd8d0.pdf
    • https://cdn.sqhk.co/jesuzedavoti/VMojjjo/mobile_phones_under_6000_android_4g_flipkart.pdf
    • https://cdn-cms.f-static.net/uploads/4454419/normal_60292eb5edc5c.pdf
    • https://cdn-cms.f-static.net/uploads/4480412/normal_60215d921ff04.pdf
    • https://cdn-cms.f-static.net/uploads/4417426/normal_600c780e44e0e.pdf
    • https://cdn.sqhk.co/togixulala/cidXaji/common_job_interview_questions_and_answers.pdf
    • https://static.s123-cdn-static.com/uploads/4489244/normal_5ffd446c1fd7f.pdf
    • https://static.s123-cdn-static.com/uploads/4414487/normal_60085c1f94d76.pdf
    • https://cdn.sqhk.co/moviferu/ggy7qgc/watch_movie_with_friends_online_app.pdf
    • https://cdn.sqhk.co/rolileduvof/hgcicHI/sugar_baby_phone_calls.pdf
    • https://static.s123-cdn-static.com/uploads/4412387/normal_5ffa85abf1b5b.pdf
    • https://static.s123-cdn-static.com/uploads/4381751/normal_5fc9190a52a26.pdf
    • https://cdn-cms.f-static.net/uploads/4470405/normal_602302374fe13.pdf
    • https://tifidanubaliso.weebly.com/uploads/1/3/2/7/132740836/wogubofikikix.pdf
    • https://fiwibafufo.weebly.com/uploads/1/3/0/7/130774969/e04434e7d5e6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0e733887-fd72-4d21-8b10-0a39cafbc931.filesusr.com/ugd/1e4d10_b7fac740582943c5b24a4cfe9a1f39ee.pdf?index=true
    • https://30de3caf-c510-4ce9-8691-b8280dc60d9b.filesusr.com/ugd/4980ee_c5f5b78bea9941ad8ecbe0f77368ac77.pdf?index=true
    • https://305aa2e3-e1d2-413d-aa2e-f1bb83d03ded.filesusr.com/ugd/92ee2b_33db22284d924bc191bfff26e8f857e0.pdf?index=true
    • https://2d130471-2a64-48ba-87cf-8f1e86c6acad.filesusr.com/ugd/9c43ec_f53bac8249bd4596a8ea4797dfcebdaa.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_off00013bf7.bin
82c962f4b3dfc497a76b32ef09421549a9c8e5a628b4693a1ede295af3d96883		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF7 5288 bytes
font_01_sfnt_off00014e14.bin
e5f48a9479631f9cfd9709adcc01ec1f0a881bf2b6ee6f77c1408d4c847f2488		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14E14 11448 bytes

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