Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac922e52ae7f8336…

MALICIOUS

PDF

83.0 KB Created: 2021-03-15 08:31:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b33281ff52191965f24980231a4bbaef SHA-1: eff0cea01e6c1a87c3cc5e4fbb249a464609b317 SHA-256: ac922e52ae7f8336f5908d02e396a6b6f7df222f760271a6226c6ed3db0d6337
134 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, contains references to 'advertising creative brief example pdf' and is associated with numerous links to disposable hosting, suggesting a phishing or malware distribution lure. The presence of embedded URIs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further support this, indicating the document is part of a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://soxebez.ru/award?keyword=advertising+creative+brief+example+pdf PDF link annotation
    • http://honey-love.ru/siwigixisutodoripone7l775.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447097/normal_6041a8dd59934.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486982/normal_60184d6f02332.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475572/normal_600efc4d63005.pdfIn PDF document text
    • http://tinipen.medianewsonline.com/edible_water_blobs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460255/normal_5ff32ee5d31d7.pdfIn PDF document text
    • http://tophomework.space/4388833467b6a8b.pdfIn PDF document text
    • http://ihsteam.ru/satamorefowipemobanigikewlp83p.pdfIn PDF document text
    • http://prizinsta.site/kedozolagco1i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462066/normal_5fda067d96b50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500208/normal_6009cbf068f5d.pdfIn PDF document text
    • http://erkutungotu.com/43259942907pavmp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366647/normal_603f7a28005b0.pdfIn PDF document text
    • http://worelimupuvefam.mywebcommunity.org/teacher_retirement_letter_to_board_of_education.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379611/normal_6026a4f308e20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449185/normal_6024516ce54bf.pdfIn PDF document text
    • http://tepugorotewole.medianewsonline.com/stephen_king_the_stand_book_plot.pdfIn PDF document text
    • http://dofujifeluradep.medianewsonline.com/free_crochet_patterns_for_blanket_squares.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tuzuxutetug.atwebpages.com/gudapewa.pdfIn PDF document text
    • http://xedemigu.atwebpages.com/62375941754.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_off000105d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D2 5732 bytes
SHA-256: 96ebdf28bbdad7284d8bc3dad4239de5990c9f40cae91172375b1d088dc2c1e1
font_01_sfnt_off00011952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11952 10844 bytes
SHA-256: 780ef1b3d3a911c6032639f0ae51b06bd768667833afb028b33d26386d0c657a

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