Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c88b2d8e8727e39…

MALICIOUS

PDF

81.0 KB Created: 2021-04-12 21:29:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99f8e79c8ffcc5ced589c50ca566d224 SHA-1: 26ef409f658d3d01e60216658c3d81cfbba2ffc5 SHA-256: 1c88b2d8e8727e3994a456faf7d8fdaf9d95f8986a3219915c348da9780e3820
126 Risk Score

Malware Insights

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

The PDF contains an embedded URL that redirects to a suspicious domain, likely intended to phish users or deliver a payload. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to search queries, further supporting a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://dafemum.ru/strik?utm_term=what+is+the+best+mini+fridge+for+beer
    • https://static.s123-cdn-static.com/uploads/4449616/normal_5feee0758d940.pdf
    • http://trylait.pro/sunumuresiwufijakawesi81cg0.pdf
    • http://profaudit32.ru/how_to_build_a_website_with_wordpress_and_godaddytc9fv.pdf
    • http://mirror-x.org/8688711963eyq61.pdf
    • http://fruitik.space/zuderafawumefudkgxrp.pdf
    • https://cdn-cms.f-static.net/uploads/4410216/normal_60326a7dae32e.pdf
    • https://cdn-cms.f-static.net/uploads/4417519/normal_60296ed7eae7a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://438c9214-13ba-44a2-8469-a4c97ff43377.filesusr.com/ugd/5d46a0_90d93ee86ec144c489bd558bb762d7c5.pdf?index=true
    • https://s3.amazonaws.com/wogikokuzotaxa/cibil_transunion_score_sample_report.pdf
    • https://uploads.strikinglycdn.com/files/e0beb14c-9ce1-4592-b346-3de886174a8a/93433293490.pdf
    • https://30621b86-6952-4b41-80af-4d24d830bc7c.filesusr.com/ugd/122077_c97df3101db54c42b47a75f46cc733b6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3b37b764-b32e-4c99-a5e1-000daac5e568/online_mechanical_engineering_degree_california.pdf
    • https://7f993087-45f6-41f4-96e5-9dcaca18fb91.filesusr.com/ugd/9a92dd_66cc45bd703c41948fdd24b670da548e.pdf?index=true
    • https://s3.amazonaws.com/jinabom/scag_36_walk_behind_parts_diagram.pdf
    • https://s3.amazonaws.com/widofafane/puzatugopobimax.pdf
    • https://s3.amazonaws.com/kujapomib/60490278672.pdf
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_686b0686b227454f84f0f4d45307adb6.pdf?index=true
    • https://cad90261-f038-4e8a-b384-2e0e37e6cb8c.filesusr.com/ugd/4c4e45_7a77f3cbd0784b29b8eaa1e8c2e2606c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cf731cc0-2839-47c5-ab9e-4d058a76bd8c/jeduxajomemekuguwu.pdf
    • https://3c86e5df-9a55-47dd-9d5b-c207b25ec6cd.filesusr.com/ugd/72bf36_6ef11a50609c4a90820a8da72d26b83a.pdf?index=true
    • https://aa6d2f86-95e2-42cc-897e-6bbd71c3a116.filesusr.com/ugd/78daac_ce244e40086f4cef84630cfcbb3a01dc.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1f68a0bc-22be-4f95-b024-7d9c176dc6fb/how_does_density_affect_gravity.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_off00010019.bin
65fd6a75de85dc2b754cb01616e83dac89d5a77f44f5685bbbf69d00996e266a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10019 5440 bytes
font_01_sfnt_off0001127a.bin
3a6be3bcc5263f188511b74b0342ca8404fa83564ffdfed2d6dd2d297de5ea88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1127A 10580 bytes

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