Malicious PDF — malware analysis report

Static analysis result for SHA-256 6028a53a9a5bc1d5…

MALICIOUS

PDF

156.8 KB Created: 2021-09-14 12:28:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: b5b4b1497b6e92ccf2f27ec185b2deff SHA-1: 44274852283937a6c3ab5b0b7abeceadff923047 SHA-256: 6028a53a9a5bc1d5975833b2bf35ea14b00bb81389111f00a53b611db62d5420
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9851

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 https://garglob.ru/uplcv?utm_term=faithful+prayer+of+a+righteous+man PDF link annotation
    • http://www.cafeinca.com/img/public/contenido/file/84069594041.pdfIn PDF document text
    • http://metzlerranch.com/userimages/xubovagogumagujewov.pdfIn PDF document text
    • https://gangnampools.com/contents/files/7868993170.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/42943092148.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/40056782251.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/91267805830.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/88014661310.pdfIn PDF document text
    • http://infosierra.es/images/editor/62914875525.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/fiwurutol.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/2635957392.pdfIn PDF document text
    • https://alternativi.brtim.com/uploads/wysiwyg/files/99331877739.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/34260415843.pdfIn PDF document text
    • http://poliinc.com/upload/files/laxixewegizumigirogu.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/27126048697.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/puwedimixekopow.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/83884966549.pdfIn PDF document text
    • http://www.siposferenc.hu/html/kevepowuzusimivasik.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109100837161079.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/migetanizepuji.pdfIn PDF document text
    • http://ckudzcssffhhj.handysociality.com/upload/files/97043485083.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wiwofogijireneguf.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/85482454322.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/xijowitezowatasuzup.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/kovirigerunipabutubivovu.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/56234978709.pdfIn PDF document text
    • http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/51896725168.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/68949127814.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_off0001f55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F55C 10996 bytes
SHA-256: ec6d0b86b416998d91f47a1d294ae8c814e60b5466ff80f45effd2fe3d859cb3
font_01_sfnt_off00020ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20EBD 23840 bytes
SHA-256: d93f103ef2b6be45a165543e64b4cffb4d63ea7971c0420ac89bc22c00ba24ad
font_02_sfnt_off00024c6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24C6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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