Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5a6b3d91c275250…

MALICIOUS

PDF

71.9 KB Created: 2021-06-10 09:12:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: dae0c11b457635934a90ea5ad90da920 SHA-1: a886a6ae5cc026504268c5b0397e083a99d513c4 SHA-256: b5a6b3d91c2752508849edd50e99a040fc7ea9f4192928dd5b4911ebb94dbb59
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, many of which point to disposable hosting services, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://krisoc.ru/pbw?utm_term=housefull+2+full+hd+movie+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485589/normal_602ce4893491b.pdfIn PDF document text
    • https://xaviloxoganobe.weebly.com/uploads/1/3/1/3/131383750/d5ad070.pdfIn PDF document text
    • https://motapesuna.weebly.com/uploads/1/3/4/7/134749044/wolafoji.pdfIn PDF document text
    • https://vitiwujujoter.weebly.com/uploads/1/3/4/6/134659282/xasodopi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465252/normal_603667216e05d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500910/normal_604ae63321c8e.pdfIn PDF document text
    • https://forelidik.weebly.com/uploads/1/3/0/7/130775511/fbb239099ef6300.pdfIn PDF document text
    • https://ximilebikunupi.weebly.com/uploads/1/3/4/8/134875253/6017711.pdfIn PDF document text
    • https://bepewosub.weebly.com/uploads/1/3/4/4/134445398/maxewofusebipikoli.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422640/normal_5fdc63a259755.pdfIn PDF document text
    • https://jujuguzifise.weebly.com/uploads/1/3/5/2/135299578/595ca5e88c752d8.pdfIn PDF document text
    • https://mumoporexebaxuz.weebly.com/uploads/1/3/4/3/134339912/kikadojaxijakuxod.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/8f3969ab-c11a-4505-9b00-a29db52c6c93/painting_canvas_sizes_inches.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb1942d1-bd10-43f4-93bd-d69cab75cba7/elite_platinum_2.1_qt._oil-free_air_fryer_-_black.pdfIn PDF document text
    • http://pulixojesu.pbworks.com/w/file/fetch/144513501/58880469198.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/039205a1-22dc-4049-9e93-c13001e8536a/microsoft_project_2016_tutorial_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c894d59-336d-4340-9cea-a96b41b9801d/vakowolar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0c8e889-c37c-4e26-b533-ddfefa97324b/rivigatogefetugopenoto.pdfIn PDF document text
    • http://dutamaboxiwa.pbworks.com/w/file/fetch/144799344/how_to_detect_si_joint_dysfunction.pdfIn PDF document text
    • http://ronojew.pbworks.com/f/gcse_simultaneous_equations_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/615c6934-bf38-4cb2-861f-65e12f10550f/dr_weil_anti_inflammatory_diet_pyramid.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_off0000dd0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0C 5296 bytes
SHA-256: a960105ac1d0e0d799a3857bf0b02310879ac1f4c166ab6d46599e056bb046d2
font_01_sfnt_off0000ef02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF02 10288 bytes
SHA-256: f643ba59aa19e5e63fa97577f035ba1753d2951ad277210174e3d95e525e1522