Malicious PDF — malware analysis report

Static analysis result for SHA-256 385f5d139c1f2bda…

MALICIOUS

PDF

83.6 KB Created: 2021-04-18 20:42:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08c60d82f58b0b06d0f19d08a6a79e1e SHA-1: d6ed8e7d56f0780f9b097b5164d9d9d917137842 SHA-256: 385f5d139c1f2bda886f0d2a58155a1aeae689b9a36cbe3dcc6bc10a4f0c4799
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 point to other PDF files, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the presence of numerous external URLs and the heuristic 'PDF_SEO_LINK_FARM' indicate the document's primary purpose is to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/strik?utm_term=how+many+years+of+training+to+be+a+navy+seal
    • http://rixanemusijod.mywebcommunity.org/activated_carbon_manufacturing_process.pdf
    • https://cdn-cms.f-static.net/uploads/4461791/normal_606632f96269c.pdf
    • https://cdn-cms.f-static.net/uploads/4379610/normal_5fe99c37b2f2a.pdf
    • http://bidizujimon.getenjoyment.net/the_data_science_handbook_github.pdf
    • https://static.s123-cdn-static.com/uploads/4464067/normal_5ff80c0e882d9.pdf
    • https://static.s123-cdn-static.com/uploads/4413227/normal_5fdff5e8c57c9.pdf
    • https://cdn-cms.f-static.net/uploads/4367273/normal_601eeb81ee060.pdf
    • https://cdn-cms.f-static.net/uploads/4408993/normal_601c8e2fac00b.pdf
    • https://cdn-cms.f-static.net/uploads/4420756/normal_6044f7f1ecdeb.pdf
    • https://cdn-cms.f-static.net/uploads/4463533/normal_603979cc4bc5d.pdf
    • http://xizugef.medianewsonline.com/automation_in_microbiology_laboratory.pdf
    • https://cdn-cms.f-static.net/uploads/4372085/normal_6052c6ea77569.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://9e1e9198-0fe7-4103-8084-fdcc6befb8d5.filesusr.com/ugd/2f7815_b4badb9dd9364c048b34a1db2f448384.pdf?index=true
    • https://s3.amazonaws.com/tajimipojimo/48641649482.pdf
    • https://36535336-4f9e-4c0a-b1ad-3385cb5d4299.filesusr.com/ugd/15ebe2_81ebe22f11134cad9a37a0e06e9e9346.pdf?index=true
    • https://s3.amazonaws.com/dejazuvorira/40722899217.pdf
    • https://s3.amazonaws.com/davubewu/70809518915.pdf
    • https://s3.amazonaws.com/wefadep/fisifasetisarazizeboze.pdf
    • https://s3.amazonaws.com/zikeko/intel_dq965gf_cpu_support.pdf
    • https://cfecb619-c0f5-418d-ae9d-b1147643389f.filesusr.com/ugd/4cd51e_68a3fbe8fa85489b97fdafee2ad72d2d.pdf?index=true
    • https://s3.amazonaws.com/fuvidokibet/xovoriworelisosowavitag.pdf
    • https://s3.amazonaws.com/kefefetafij/75657589603.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_off00010a6e.bin
e6b6406f774a92b10c9c1c0f7c70f7f70638af87fe66c1637693d13c6661c973		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6E 5440 bytes
font_01_sfnt_off00011cf5.bin
d5a6f06d667f57305d8a7174cdc66f3fc4cb6ffc21f3823aecc02e8dfc98a32e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF5 10380 bytes

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