Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9ab80bbb1c0a098…

MALICIOUS

PDF

85.1 KB Created: 2021-04-11 19:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 8cdd23963572f61a011a2645a09fdfdd SHA-1: 5b7f62a2cebbd4c8aad93fb124d55f456340901f SHA-256: a9ab80bbb1c0a09843bb01f40846fb5fbbfb81b9d4ca17d4cb7da8214a43f86a
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 or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

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://dugedepap.ru/strik?utm_term=add+author+to+wix+blog PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366358/normal_600dacaf0a14e.pdfIn PDF document text
    • https://likojekiputisi.weebly.com/uploads/1/3/4/5/134576895/bafusowupi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380695/normal_60586eb58b62b.pdfIn PDF document text
    • https://jepunitapo.weebly.com/uploads/1/3/1/0/131070437/kukosakagoduzorim.pdfIn PDF document text
    • https://logifuvixejexa.weebly.com/uploads/1/3/6/0/136019385/wugoxupuvowik_gasuvawaligub.pdfIn PDF document text
    • https://jarowuvuvam.weebly.com/uploads/1/3/4/6/134614172/zavegezexikipa.pdfIn PDF document text
    • https://xikewewojan.weebly.com/uploads/1/3/4/0/134095915/megomumonukana.pdfIn PDF document text
    • https://posukezeke.weebly.com/uploads/1/3/4/7/134746748/7451426.pdfIn PDF document text
    • https://cdn.sqhk.co/rikopekela/hjgeKih/mi_note_6_pro_launcher_apk_download.pdfIn PDF document text
    • https://gamuzajebi.weebly.com/uploads/1/3/4/4/134481120/ziloximevukojixewaj.pdfIn PDF document text
    • https://gugivubur.weebly.com/uploads/1/3/4/3/134390132/e24ebf8c18af946.pdfIn PDF document text
    • https://cdn.sqhk.co/butaliwe/6aIaZia/74128425337.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fedure/dejupewibuvix.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/other_words_than_stressed_out.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/832118688.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91bb6708-a33e-4094-9567-e93e598c1379/48759059463.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/886e372f-d599-4e6e-afb8-bc6b3065c7ee/nizekepumififu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e8c041a-565c-487b-9775-6cc8ab6456db/how_much_is_a_ged_practice_test.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_off00011045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11045 5196 bytes
SHA-256: 71599b2129ccce2271bc7d18429d0f728a4766c7927d8ce12565ba4233651d38
font_01_sfnt_off00012201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12201 10468 bytes
SHA-256: ba19165817d7c9bbc95f7dfeda7494192570345b09363f42034e2614e0504634

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