Malicious PDF — malware analysis report

Static analysis result for SHA-256 84724bdb463e5ccc…

MALICIOUS

PDF

76.3 KB Created: 2021-03-25 04:39:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 25d5bba4149146af0d77b925513bba4c SHA-1: 5ae73f908f1c4e3bf95a7b614eabb6d3d994ffb6 SHA-256: 84724bdb463e5cccb4a4a68589605298e3dc234252007a51301efc6b5f4c9ffc
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially malicious content, possibly for SEO manipulation or credential harvesting.

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://vilenefex.ru/award?keyword=pin+bar+strategy+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4447258/normal_603e7638b0f23.pdfIn PDF document text
    • https://cdn.sqhk.co/tikikizeveni/PNegh1v/cartoon_network_movies_to_watch.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369520/normal_602ea7879856e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451567/normal_6013b7877dd2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469836/normal_6016c3b80ca8c.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwadezab/janZ6hf/66015846283.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410988/normal_604117c937a12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417983/normal_603752660b0e2.pdfIn PDF document text
    • http://zaduzoronogikex.22web.org/61514094441.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378405/normal_5ffbb0bd6cfec.pdfIn PDF document text
    • https://cdn.sqhk.co/zuronenom/ochbibl/paper_toss_apk_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/fomolunuvufa/chblih0/kasegedenebiv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://taperimogitunal.epizy.com/europa_league_final_match_report.pdfIn PDF document text
    • https://s3.amazonaws.com/neporezofov/26442117562.pdfIn PDF document text
    • https://30c74dc1-c3f2-4e71-8253-1ec84f3b94e1.filesusr.com/ugd/b8c6fa_e4fd558f13554b79a6df228fc069894e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/banshee_episode_1.pdfIn PDF document text
    • http://bogibil.rf.gd/30022874600.pdfIn PDF document text
    • http://fekalalorupip.rf.gd/nunigalajapijoma.pdfIn PDF document text
    • https://165b0ab0-89c3-4517-b88f-e2bd0c55d975.filesusr.com/ugd/97b555_8600110c00cd4657b6ce851af679e6d3.pdf?index=trueIn PDF document text
    • http://pemukusa.epizy.com/97997930026.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/gaworipujat.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_off0000e9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B2 5420 bytes
SHA-256: ed244a93ab986bcca112bdea33dc9bf65926bcc98d4fc74456fda5ec7dbc33cc
font_01_sfnt_off0000fc2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2F 11420 bytes
SHA-256: 55993d480ec8c976ba1b1c0b8d83bf4b5f1e191feb50ea2666e43521915409c6

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