Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c20f0926034bb82…

MALICIOUS

PDF

65.6 KB Created: 2020-11-30 02:24:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa7b81a4df12760cae1a1e08001531d7 SHA-1: aded6d3ec20170136111bd214762c65c40760e2e SHA-256: 0c20f0926034bb825f90a10efc022a16940ce69b87a18bfd889603d89a48ac0d
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a coordinated effort to manipulate search engine results or distribute malicious content. The ClamAV detection and ML classifier further confirm the malicious nature of the document, likely serving as a phishing lure or a distribution point for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ggtraff.ru/strik?utm_term=julie+watson+beloit+wi
    • https://cdn-cms.f-static.net/uploads/4374022/normal_5f8a9e738a0d4.pdf
    • https://cdn-cms.f-static.net/uploads/4370270/normal_5f9f1be6cfdfb.pdf
    • https://limumowitizuwag.weebly.com/uploads/1/3/4/5/134587832/e040e06.pdf
    • https://cdn-cms.f-static.net/uploads/4389821/normal_5f8d8c7be3b59.pdf
    • https://cdn-cms.f-static.net/uploads/4421787/normal_5fb9364416378.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3a884eb3-a345-4d8f-9902-9d50ea7bcdce/copy_a_level_for_copy_monitor.pdf
    • https://uploads.strikinglycdn.com/files/ba511ec6-0c18-44e4-bf72-69a53faac105/tizik.pdf
    • https://s3.amazonaws.com/tajimipojimo/wutofarijo.pdf
    • https://s3.amazonaws.com/xapidajovaji/wolonanod.pdf
    • https://uploads.strikinglycdn.com/files/54a2e656-d262-4055-8711-ce2af926c7b3/maggianos_reheat_mushroom_ravioli.pdf
    • https://uploads.strikinglycdn.com/files/c27c0071-9b63-4dac-9f6a-4a275dc2d690/conceptos_de_sistemas.pdf
    • https://uploads.strikinglycdn.com/files/c1f029ca-a0da-4a6b-a7fb-c9672c9711e5/virginia_woolf_a_room_of_ones_own_summary.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_off0000c476.bin
6e22b533325b989f816849ba14831fca01ee1d1aef0d0f9b61a9af140231bd11		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC476 4804 bytes
font_01_sfnt_off0000d4f3.bin
debeacf790bd88b865039d91569a64423083fb08d7bbee82b9d834e4f22b28d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F3 11132 bytes

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