Malicious PDF — malware analysis report

Static analysis result for SHA-256 808cca4b87d7d7fe…

MALICIOUS

PDF

79.3 KB Created: 2020-12-27 08:48:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: c9feff171795e276fbc8688e47920200 SHA-1: 26e85b9fcf2e0876f9d2e15aaade6c030a8f1f42 SHA-256: 808cca4b87d7d7fe749c5b631d79084406e6eb256560c8fc9a7e0e3e176614ab
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://trafficel.ru/aws?utm_term=service+electric+basic+cable+tv+guide PDF link annotation
    • https://xojozojejaxito.weebly.com/uploads/1/3/4/8/134866115/pepuvagajuzi_munumebu_gutinelovit_letovamusup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366014/normal_5f900aa00d0c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368219/normal_5f87abd3d75fe.pdfIn PDF document text
    • https://vekeliludodim.weebly.com/uploads/1/3/4/7/134745250/zanuma.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365553/normal_5f87c4ef4f248.pdfIn PDF document text
    • https://cdn.sqhk.co/xumobopore/v8jggha/46020917647.pdfIn PDF document text
    • https://tikedamo.weebly.com/uploads/1/3/1/4/131453682/2479b4095aae4d5.pdfIn PDF document text
    • https://dawifebenunu.weebly.com/uploads/1/3/4/3/134374742/5868139.pdfIn PDF document text
    • https://cdn.sqhk.co/lilapanorup/NLu2Cih/67481835256.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403539/normal_5fe3a2f11021d.pdfIn PDF document text
    • https://rogusedi.weebly.com/uploads/1/3/4/4/134433103/wesakexumorupa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c73d6419-f168-4e8e-af76-88e226d6f09c/windows_server_2003_r2_vl_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09761c5e-51af-4fe0-b551-b58ed004d13e/1594941146.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d2ab41e-9a87-4d1e-b041-8656aca4f6fa/advanced_linear_algebra_lecture_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bace6ca2-c576-416c-84fe-4eafc2e42059/dont_escape_4_unblocked_games.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f82c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82C 5408 bytes
SHA-256: 501c04e8d8a50184062d3d4c14125f8ca536f320b348446f91bc7dd673c6a89e
font_01_sfnt_off00010a9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9A 11168 bytes
SHA-256: efbac5a86d997b642ae0aa6351d4f73184199e307f1798b130bc126d9142913f

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