Malicious PDF — malware analysis report

Static analysis result for SHA-256 f678aa20b29aad47…

MALICIOUS

PDF

79.7 KB Created: 2021-06-06 17:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 91c363abfdee00ec5def3142dfc17965 SHA-1: c5f8872ba41f420c19a784030cc4c0762004b99a SHA-256: f678aa20b29aad473e45000fdeadb4140b690cef1ab70eadc700ae86f11918b1
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://nomylo.ru/pbw?utm_term=how+to+use+bright+white+smile+pen PDF link annotation
    • https://minesipapotevu.weebly.com/uploads/1/3/4/1/134108733/3959417.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480748/normal_603b6ac13c2cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415065/normal_606c3a9477c11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445555/normal_6016c2c950535.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443809/normal_605c65f11d263.pdfIn PDF document text
    • https://xogexemufak.weebly.com/uploads/1/3/1/4/131437987/gonuvulariletuliv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485313/normal_60073a20b3e68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421939/normal_601b557edda52.pdfIn PDF document text
    • https://bupogoduvokog.weebly.com/uploads/1/3/4/6/134690502/d7a67.pdfIn PDF document text
    • https://xiforamuti.weebly.com/uploads/1/3/4/6/134611992/a0cdd383bab7c4.pdfIn PDF document text
    • https://ronumotesagazuw.weebly.com/uploads/1/3/4/3/134373959/6886219.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://najapenoz.pbworks.com/f/gimumuwiruwisot.pdfIn PDF document text
    • http://vowujepojez.pbworks.com/f/jekarodegu.pdfIn PDF document text
    • http://juvudibip.pbworks.com/f/is_citrus_manga_over.pdfIn PDF document text
    • http://kukepofarit.pbworks.com/f/suddenlink_remote_setup_1056b03.pdfIn PDF document text
    • http://nukuxim.pbworks.com/f/padujowakijevotizudufu.pdfIn PDF document text
    • http://fudotedafeji.pbworks.com/w/file/fetch/144711195/what_is_notification_bar_in_phone.pdfIn PDF document text
    • http://noxiwako.pbworks.com/w/file/fetch/144498597/83527405101.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_off0000fa5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5D 5216 bytes
SHA-256: 2bf21e25942e4cad701884a8412c3b16a15ec0c0e1b5d9826bb0edf2a5ae9038
font_01_sfnt_off00010bfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFD 11176 bytes
SHA-256: b4ac9aed45a3950210ecc106bf376f5494875d94238a31882773d139d3fffff8

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