Malicious PDF — malware analysis report

Static analysis result for SHA-256 55b9de523f81d014…

MALICIOUS

PDF

74.0 KB Created: 2021-10-08 07:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 41dd76e7faef151fff4c28156f6d86b0 SHA-1: f31faa0750814625c9d3ab35da1ad4a131df9534 SHA-256: 55b9de523f81d01415fc74c50370016dcf2a89d04ca21a836342dbb76ecacf04
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high heuristic score indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the PDF structure and embedded links are indicative of an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://riverside-plaza.com/upload/userfile/files/12493280864.pdf In PDF document text
    • http://cz-synergy.cz/data/file/84804405938.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210910181739.pdfIn PDF document text
    • http://gr-chem.com/upload/files/7879921418.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/nifisowub.pdfIn PDF document text
    • https://mysilofr.mysilo.com/upload/ckfinder/files/35979795473.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/safifebigumatiwalinuref.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/12283997538.pdfIn PDF document text
    • https://melz-feu.ru/upload/sisis.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210922_062202.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/55486777453.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4tjq3haa8ppa3l9439emlpk2o7/6280866468.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/51867390540.pdfIn PDF document text
    • https://triyoga-tv.ru/userfiles/file/gifupibenawagikizo.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/615aeae371021.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210923022029_y1ry4b.pdfIn PDF document text
    • https://opremazabebe.me/userfiles/file/bodudisojawimarokoxeli.pdfIn PDF document text
    • https://cdmsig2.com/ckfinder/userfiles/files/86678122506.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16147f869415e3---10329692011.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210908_4FD1BCFBB2A19FA8.pdfIn PDF document text
    • http://tearose-kitchen.com/sites/default/files/images/imcefile/30148365686.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=retro+perspective+meaningPDF 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_off0000beb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CA 10784 bytes
SHA-256: 18cb33c800d44ac5e61823aaf8eb5b8b303e0d4a9e6fc1d776aedad3d5cb2ef9
font_02_sfnt_off0000efad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAD 16640 bytes
SHA-256: 1707b49e2634c470c0be447494bc09872acc75a3b7cb2a9e862c4f5e04ab980f

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