Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4328f6c9e05e3db…

MALICIOUS

PDF

74.7 KB Created: 2021-09-25 05:21:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0506b15a4812f3a115774abf83b6de26 SHA-1: 597b69d1cb96d0868fbd287a140bcad6d4daed5b SHA-256: b4328f6c9e05e3db5cb41ec4eaaecfdb4d1822f1ad7d20e8d2df518f03b6e771
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable or unknown domains, suggesting a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms this behavior, indicating the PDF's primary purpose is to host a large number of links on potentially untrustworthy sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://izumrud38.com/ckfinder/userfiles/files/vivaw.pdf In PDF document text
    • https://redengewinnt.com/userfiles/file/1957694648.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/kcj4eetu92v350kdlgj1hh3tb1/komufalanipunosavazekeras.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/35730120114.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/luliganawawiligematisa.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/xafisajomokedu.pdfIn PDF document text
    • https://magic-ray.shop/uploads/files/83474321888.pdfIn PDF document text
    • https://adikkedua.com/contents/files/rajodimaxibuliju.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/buzanutuvin.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/vizizewupodilumasaru.pdfIn PDF document text
    • http://gpshardorawal.com/hemkunt/userfiles/file/vaxexepuwosobow.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/lugaragafegiwusajetuxan.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/95182165517.pdfIn PDF document text
    • http://geotersrl.it/file/71743410386.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/14403755534.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/24974622245.pdfIn PDF document text
    • http://haki.tincorner.com/uploads/files/48120189443.pdfIn PDF document text
    • http://torgoborud.org/images/file/1251129486.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/72889258177.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/33640187905.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/68707940185.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/remugidivepexokapu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+turn+off+tracking+on+samsung+phonePDF 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_off0000bbf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBF6 18392 bytes
SHA-256: 5ee9077aad90d9c4387cf52352a64e743eaa0d86f1067400cbb0a27676f56d0b
font_01_sfnt_off0000eb97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB97 11152 bytes
SHA-256: 089dd556cf55515654ab2b083498ee8465b2839faa72c9d57c66888f4c4742c0
font_02_sfnt_off00010588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10588 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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