Malicious PDF — malware analysis report

Static analysis result for SHA-256 b466a00b574f631f…

MALICIOUS

PDF

70.8 KB Created: 2021-09-25 02:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1932813cde1526a86d85b3399d851767 SHA-1: ee40ddaa021e038237748f3b25c661157b40757c SHA-256: b466a00b574f631f391b9edc14fe113fc6834c35d96ad92a99180d55aaf26310
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, hosting numerous links to external PDF files on disposable domains, with a high number of distinct hosts. The embedded URLs suggest an attempt to redirect users to potentially malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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 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 http://nemdanangpho.com/uploads/2021-09-16/images/files/47500131807.pdf In PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/pawatevutumorekelol.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/nuvavipid.pdfIn PDF document text
    • http://stilna-ya.com/_userfiles/file/jewejukuxifijejugazew.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/34003386691.pdfIn PDF document text
    • https://shinaltd.ru/images/file/derilawarapolavafored.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/tetomipidevanegitulupi.pdfIn PDF document text
    • https://krygina40.ru/UserFiles/File/tolezotifamarizutenezide.pdfIn PDF document text
    • http://stroyindustry.com/userfiles/file/zenirasedofuvofedajamo.pdfIn PDF document text
    • http://esejsc.com/upload/files/12447559807.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/51763514730.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/96166526123.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/gijeseniragajobetoxaxope.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/643519347613d8eed17c57.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/72640280483.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/40954130866.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/redegekalinizimojuramew.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/vunivesag.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/65487805080.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__613DF28158957.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/10947913380.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/kukejifujeta.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/79426677747.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=8+ball+pool+galaxy+cue+mod+apk+downloadPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF6D 17288 bytes
SHA-256: cca967236ac6ae3eaf51d1a5cb11a995166c87f902cf595248eed42d6262b593
font_01_sfnt_off0000dc1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1E 11144 bytes
SHA-256: 0f162b936972a59c5011acfeaeb2992022816b93d72fffbdd56501c19b0b8708
font_02_sfnt_off0000f5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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