Malicious PDF — malware analysis report

Static analysis result for SHA-256 5659de1a292b6301…

MALICIOUS

PDF

78.1 KB Created: 2021-04-20 01:19:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c4839f463f6cf90f2aea23f1650a7ff7 SHA-1: 5f3edaf8af0951cfc50a40e9d07e7f57c3958bbf SHA-256: 5659de1a292b63014df6355e785b829b63d0d27e174973944a8abc28fcaa59d6
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links. No scripts were extracted, but the structure itself is indicative of a malicious campaign.

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://leonvi.ru/strik?utm_term=blackburn+trakstand+manual PDF link annotation
    • https://cdn.sqhk.co/tumosirewuw/jg1Khe0/vilolopivusuxatedowuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417525/normal_6010fcc53f9f9.pdfIn PDF document text
    • https://cdn.sqhk.co/zezinojox/hhJzpvp/new_among_us_guide_steam.pdfIn PDF document text
    • https://leditolovon.weebly.com/uploads/1/3/2/6/132682688/5329361.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415309/normal_6055c6033d66d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378390/normal_601bc5cd492c4.pdfIn PDF document text
    • https://lozusometuzasop.weebly.com/uploads/1/3/4/7/134741376/eee2dc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388065/normal_600e65716d2ba.pdfIn PDF document text
    • https://defosojuregoko.weebly.com/uploads/1/3/1/3/131383900/17c9b.pdfIn PDF document text
    • https://danigutido.weebly.com/uploads/1/3/1/1/131163693/ec28e2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://susodiwur.epizy.com/bekaboo_episode_7.pdfIn PDF document text
    • http://napepezubebefiw.epizy.com/freak_the_mighty_chapter_11_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24041056-3bd9-499e-bf79-3a3bcc6518ee/casio_sgw-500h_reset_hands.pdfIn PDF document text
    • https://21319658-e817-4d6a-846f-872ccfe0f0c2.filesusr.com/ugd/982af2_0fb2bfe396f64e55a14b815d5fc1e3d6.pdf?index=trueIn PDF document text
    • https://0f926834-650c-4d5a-b53c-ad60ae412ccc.filesusr.com/ugd/6a44d8_64b5a9a54c18475c9a1df1c8e873546e.pdf?index=trueIn PDF document text
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_411ade90180b4770b2d7b456ebb1d7b8.pdf?index=trueIn PDF document text
    • http://losobome.rf.gd/93622356443.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4eca98b0-3361-4e2b-b887-423288a61ca2/dafafas.pdfIn PDF document text
    • https://6593eeda-10fe-4128-810f-cbbc79f0a4f8.filesusr.com/ugd/c0a4bf_22d6bad7c25849d09382e5fbd17ba5d5.pdf?index=trueIn 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_off0000f110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF110 5336 bytes
SHA-256: 30327d2cb9fc85e379078711d6c052287daed8002b2106f4b963237c29aee866
font_01_sfnt_off00010321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10321 11372 bytes
SHA-256: c225e91ed41556583ac36b16679df8ab8b93e9c8c7ede37f805dea290c2eb71d