Malicious PDF — malware analysis report

Static analysis result for SHA-256 3752ede845d2c584…

MALICIOUS

PDF

80.3 KB Created: 2021-09-11 08:29:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 306a6ffaae557868d0f1c2adfbc2fe65 SHA-1: 5e0967294e1996cbeafc0d320bf9b3a6df82d577 SHA-256: 3752ede845d2c584a8b1e9daa4597194ba18f90774e93171714e5085bace2ee0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the sheer volume of external URIs point to a coordinated effort to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://catamma.ru/uplcv?utm_term=how+to+rotate+a+pdf+permanently PDF link annotation
    • http://czerwoneiczarne.pl/files/file/67783532597.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/rijidugujalarom.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/33818673543.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/608216394.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/vuvapemodepaluzo.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/rujujobejipipabi.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/4534145257.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202109100633233462.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/jabuxerituv.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/26465207910.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/wutijore.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/raxatalupilaluwirenenatu.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/76130379692.pdfIn PDF document text
    • http://turinimoti.com/assets/userfiles/file/wuxumijerozekaximekuzuke.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/68312805841.pdfIn PDF document text
    • http://korytnica.net/data/files/12812440819.pdfIn PDF document text
    • http://maydemtienvn.com/upload/files/vopoborex.pdfIn PDF document text
    • https://xebecdesign.com/xebec/userfiles/file/sogisafe.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/lakujeze.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/lefiviwizewukejuzasut.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/maxejosenisiropivab.pdfIn PDF document text
    • http://one9five.com/userfiles/files/wuvogipurewujefefepototer.pdfIn PDF document text
    • https://viktorina.ledoritulys.lt/files/22222831544.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/7h6il4lof891nfh60duhjp45v1/26054884167.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/wugiburitanutimagawoj.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://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_off0000d558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD558 17784 bytes
SHA-256: 744af4c6efbb4a0f63e4328b770417a139d73485d5b08470a1ac264a5cd582f6
font_01_sfnt_off0001034b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B62 10592 bytes
SHA-256: a164412b444bf9ae1af9eb503db21a8156f3702058fea98d5fbc532c88a234b4

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