Malicious PDF — malware analysis report

Static analysis result for SHA-256 45837f505fd46acf…

MALICIOUS

PDF

76.9 KB Created: 2021-09-13 16:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c3eebd1591909853327b69f0f67b3d6f SHA-1: c421031884f7243721b8a06f53174faa8d9c9355 SHA-256: 45837f505fd46acf8902391b6c71d63d088a557a8d8c5b43ed13ba0bd4e5417f
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The presence of a link farm on disposable hosting, with numerous links pointing to PDF files, suggests an attempt to distribute malware or phishing content. The 'utm_term_redirector' flag further supports the idea of a deceptive link intended to trick users into downloading files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://marupyara.com/fotos/userfiles/file/57407794515.pdf In PDF document text
    • http://techcessgroups.com/userfiles/file/87112263642.pdfIn PDF document text
    • http://pjteam.hu/uploads/netewogagu.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/68795613517.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109070427362747.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/84570511555.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/47771982136.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/voduzimiv.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/65109597331.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/gogufepaxepunogabo.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/nirelesedobixosi.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/palefutox.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/widubasonoxavegisimi.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/jopijasibuzemisuda.pdfIn PDF document text
    • https://spyboarcams.com/files/zunugukukawipaji.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/63231312138.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/73437932293.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/57517515028.pdfIn PDF document text
    • http://nincity.de/inline/file/fidipiruzojufadu.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/larigoziwi.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/vivebekofolakekuwijik.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/tewozixubuvabugivisawi.pdfIn PDF document text
    • http://www.slappedtogether.com/editoruploadfiles/file/40306495511.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210901_043322.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=kali+nethunter+apk+download+for+androidPDF 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_off0000c134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC134 19996 bytes
SHA-256: 617cafe5e3fd0e45da141bb89a204812e831348648ced2c97bb901c9d0058c55
font_01_sfnt_off0000f51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D33 10696 bytes
SHA-256: 735e4384a987306f3ca58f51cdf74c3fcb063d77d2ba8d0dbec120dcafd3ce7c

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