Malicious PDF — malware analysis report

Static analysis result for SHA-256 b29323b2f82a865f…

MALICIOUS

PDF

74.1 KB Created: 2021-09-19 15:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5eb38625be5b2532adf56e1de5bc440e SHA-1: f1b76f8cd5346644d1e8ab5c1e8bfbf05627b4a2 SHA-256: b29323b2f82a865f47b73b0adecf14b5ddd15440774f2be4c8d98448be267259
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm directing users to numerous external PDF files. The presence of embedded URLs and the nature of the heuristics suggest a phishing or malware distribution scheme, likely initiated via spearphishing. No scripts were extracted, but the overall structure points to a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • 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://toanthinh.vn/webroot/img/files/36234924832.pdf In PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210905_F44813685278A13F.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/zawibafojipiximuxama.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/8204342548.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/lagofal.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/84500718163.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/25840653990.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/56192780897.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/tukateruwezinupipikeze.pdfIn PDF document text
    • http://sm300159.agchost.com/userfiles/files/xazosivis.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/46922904793.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/zawakuno.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/88298341108.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/67142199152.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/kesabefetunok.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210902170446_973451337.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/70479053109.pdfIn PDF document text
    • https://bselink.com/userfiles/file/72090448982.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/11788284694.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/rurowobixezo.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/rixemixoko.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/koxobe.pdfIn PDF document text
    • https://maymac.info/userfiles/file/6445419485.pdfIn PDF document text
    • http://citra.cl/userfiles/file/satoxapeditedug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=rocket+cheat+in+gta+san+andreasPDF 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_off0000bcd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EE 10740 bytes
SHA-256: e0cc6a8c9491afa51f6309701e3f97c8695b2762c5212b0601c274d551d689e8
font_02_sfnt_off0000ed67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED67 17704 bytes
SHA-256: f12b665d9e8c39a4ec69e67df7a7715a6abf02ad9fa4d5dfa5e4702a5e5624a2

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