Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9dfabd769c27d77…

MALICIOUS

PDF

76.6 KB Created: 2021-03-22 07:02:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e6aad6d0eb47794d8534c8122df863c6 SHA-1: ca3f3205ff35b93185199b946e12537cb1cf17f7 SHA-256: a9dfabd769c27d772460423265f0de93261b470461bc48f3bb36fe7fc0894215
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, characteristic of a link farm designed for SEO spam. The primary purpose appears to be redirecting users to potentially harmful websites, rather than delivering a direct exploit or payload within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/award?keyword=alternative+energy+sources+pdf+files PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370299/normal_6049c2642f6c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378599/normal_603ab0bb607d2.pdfIn PDF document text
    • http://premiumpornclips.com/algebraic_expressions_worksheets_6th_gradef6se7.pdfIn PDF document text
    • https://livupojinobiz.weebly.com/uploads/1/3/1/8/131856358/4036271.pdfIn PDF document text
    • https://sobanuwutotamiw.weebly.com/uploads/1/3/4/1/134131644/8420951.pdfIn PDF document text
    • https://dunudafulu.weebly.com/uploads/1/3/1/0/131071166/95cba984c.pdfIn PDF document text
    • http://rigojakivuvemi.iblogger.org/kutojoxutonugebaweledok.pdfIn PDF document text
    • http://esplus.pro/836949493jhigg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369779/normal_5fff46095762e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491151/normal_5fda90f36a288.pdfIn PDF document text
    • http://organicnu.info/jipibesusijuperasasipubux72k30.pdfIn PDF document text
    • http://kefuxew.22web.org/pumul.pdfIn PDF document text
    • https://rewumakabaw.weebly.com/uploads/1/3/4/8/134856880/vonovalanugakak-kuxesi-gotutuvewoxo-wiwalofolu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482216/normal_6033e8c5712d4.pdfIn PDF document text
    • http://leninuludobodu.mygamesonline.org/60527915199.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sitafefisoju.atwebpages.com/sunbeam_heated_blanket_microplush_10_heat_settings_queen.pdfIn PDF document text
    • https://a2fe464c-28d1-4db8-bb2d-552ad9bc2f4d.filesusr.com/ugd/941bb1_d7f2060bf094472db10c68557c7b8a0e.pdf?index=trueIn PDF document text
    • http://pisonepegosa.myartsonline.com/17848920192.pdfIn PDF document text
    • https://a7474f5d-6ec7-41e4-954d-8cb0a6a0c5ec.filesusr.com/ugd/b987d2_0fd8e3c87cd1461b8cb0952df88a5971.pdf?index=trueIn PDF document text
    • http://risuzapusujafeg.rf.gd/levemowavedugedafutoxafej.pdfIn PDF document text
    • http://xaredekol.epizy.com/lab_report_template.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_off0000ec29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC29 5472 bytes
SHA-256: 80e700ffe89918b74f1d36a07d93e70420782ae0bdde283fd29e96142e268557
font_01_sfnt_off0000feea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEA 11184 bytes
SHA-256: eb9c82d6fc554efe232c16da435ed515bc7366ee53e67665d7121bbc65795db0

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