Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ab7b8e24d23f8ee…

MALICIOUS

PDF

72.8 KB Created: 2021-03-07 21:51:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: cb7633d9761f5f866cffee326e6d258f SHA-1: a26c95d326e3fdd9838bf09b0e233d31473eb8af SHA-256: 1ab7b8e24d23f8ee43c1ab5fe177fda93c63977d40e8a87c92ea17d9312580c9
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links pointing to other PDF files hosted on various domains, many of which are disposable. This behavior is indicative of a link farm, likely used for SEO manipulation or to distribute further malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, and the presence of external URIs aligns with techniques used for initial access and potentially further exploitation.

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://golowaki.ru/aws?utm_term=pack+n+play+mattress+cover PDF link annotation
    • https://gonewama.weebly.com/uploads/1/3/4/0/134095907/28d8b79e3c9e02.pdfIn PDF document text
    • https://sajurewuvow.weebly.com/uploads/1/3/4/0/134042423/dufinun.pdfIn PDF document text
    • https://walinakonefal.weebly.com/uploads/1/3/4/3/134316097/remapamijilafulir.pdfIn PDF document text
    • http://xedeporib.medianewsonline.com/52970738857.pdfIn PDF document text
    • https://tuzutetenufiro.weebly.com/uploads/1/3/4/7/134716615/6090263.pdfIn PDF document text
    • https://turonobofudub.weebly.com/uploads/1/3/4/4/134463989/mowerusapikapubux.pdfIn PDF document text
    • https://tebuwopelovenep.weebly.com/uploads/1/3/1/4/131453198/fafebarifirukodi.pdfIn PDF document text
    • https://sogazefod.weebly.com/uploads/1/3/4/0/134000298/domofafusupip.pdfIn PDF document text
    • https://rudetotupolukoj.weebly.com/uploads/1/3/2/6/132681245/6304821.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466662/normal_5ff712e9c6012.pdfIn PDF document text
    • https://xipumizi.weebly.com/uploads/1/3/4/7/134746986/7422735.pdfIn PDF document text
    • https://xejinifinedi.weebly.com/uploads/1/3/5/3/135305438/kugilire.pdfIn PDF document text
    • https://tuxibefogeja.weebly.com/uploads/1/3/4/3/134359070/65e4ee80f583.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403823/normal_60138eb1d15dc.pdfIn PDF document text
    • https://giwelexe.weebly.com/uploads/1/3/0/8/130814055/jutunugi.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/22b2b84f-1168-4373-8a26-83112d619b3d/kitujojejizu.pdfIn PDF document text
    • http://sefowolo.atwebpages.com/75910508553.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93d3d8fc-1cdb-4751-b34f-2023ac811643/how_to_program_a_traxxas_vxl-3s_esc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db118613-3d00-4369-8bc8-01d20e65ba70/91040632936.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_off0000de89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE89 5308 bytes
SHA-256: 8f2626344e35c2eb2fb678ff34d384ee456973c46a697c0d1c94ef6d0c78b0f1
font_01_sfnt_off0000f091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF091 11020 bytes
SHA-256: 626cd24b39e0ad71816b9b2c87ec92cd4fb228ec6f3505eaee200e7b72278dc0

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