Malicious PDF — malware analysis report

Static analysis result for SHA-256 786fc0b604a188b3…

MALICIOUS

PDF

82.7 KB Created: 2020-12-30 21:15:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e82e73f01c2bba0cbe417fc1b1203aae SHA-1: 1922721b0f5eb9b81c67babb8a3298e586d64fb9 SHA-256: 786fc0b604a188b3d95d20a0b221190a9f4e422b0af3bafde974a65f47178da2
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards an attempt to leverage external resources for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://trafffi.ru/strik?utm_term=switch+controller+black+friday
    • https://wijejotuxaketuv.weebly.com/uploads/1/3/4/3/134338978/3105916.pdf
    • https://vokubopupabilu.weebly.com/uploads/1/3/4/6/134691430/nugibi.pdf
    • https://joverukaded.weebly.com/uploads/1/3/4/4/134433057/f95efa9242.pdf
    • https://gikesusemu.weebly.com/uploads/1/3/4/7/134775173/burazebodajoke.pdf
    • https://cdn.sqhk.co/vavusiwi/fQnWLhg/83712745334.pdf
    • https://rovifubejoros.weebly.com/uploads/1/3/4/4/134432010/edb020d67672.pdf
    • https://cdn.sqhk.co/kezixowog/igjjhix/hill_climb_racing_2_cheats_pc.pdf
    • https://cdn-cms.f-static.net/uploads/4390324/normal_5f8e2a68397e1.pdf
    • https://cdn.sqhk.co/nokikijun/MQjdzKB/38994043493.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e62c8ee7-4236-4522-8ddf-c350e5e06be9/91975079158.pdf
    • https://uploads.strikinglycdn.com/files/8068fd69-7f19-4f3b-a1bf-9d8a49ce72bf/kadawamipuwofavugelerom.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_off00010634.bin
3b52cac35770181c6617e7e1ba0a5f6e5521b8c7bfce57ea4e3d62e49947b636		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10634 5432 bytes
font_01_sfnt_off000118c2.bin
15d9359e2ccc6f7a9dd5c9d8a3f1ad9bf6dc2c74d024363da4ee57cbd8fc3716		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118C2 10868 bytes

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