Malicious PDF — malware analysis report

Static analysis result for SHA-256 252a672c3d77395c…

MALICIOUS

PDF

74.7 KB Created: 2021-10-02 16:42:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 029589ffb71d7e408506678c46330c7d SHA-1: 3cbdfb9a19e78df276100276e442a00411aa5799 SHA-256: 252a672c3d77395c55586a04a18efb709c950303c61a61f18d035dbefd381ef2
126 Risk Score

Malware Insights

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

The PDF contains numerous external URLs, with many pointing to disposable domains and acting as a link farm. This behavior, combined with ClamAV detection and ML classification as malicious, strongly suggests a phishing or malware distribution scheme. The file's structure and the presence of many links indicate an attempt to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://queure.ru/uplcv?utm_term=enjoy+your+life+meaning PDF link annotation
    • http://kite-surf.sk/files/53013591257.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/wemuroxesebop.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/bevutewi.pdfIn PDF document text
    • https://istanajp2.com/contents/files/wupefijapito.pdfIn PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/dekedoz.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/pilotewusuwitapukilag.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614539c620b43---gozamapegogadof.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/23837289580.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/9716210666.pdfIn PDF document text
    • https://allora-tour.by/var/upload/file/90268954001.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613e89645b58a---28733961609.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/77025607254.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/65216089857.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/rapefapinibunuzijigasu.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/sekegitevumuv.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/94501863692.pdfIn PDF document text
    • http://citlak.com/admin/UserFiles/file/rakev.pdfIn PDF document text
    • http://protok.pro/upload/files/jisenarumon.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/kebajujekanusoba.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/26609411512.pdfIn PDF document text
    • http://www.grifin.sk/files/35623838577.pdfIn PDF document text
    • https://thomsonindia.com/userfiles/files/fuzidakikewegab.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_off0000bbe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FA 10620 bytes
SHA-256: 99184db423c234c3dd6301d9509120be62249525bf3bd3eaca31407207742900
font_02_sfnt_off0000ec24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC24 19316 bytes
SHA-256: 92cf93fdb61c54c6140382f16d85a49f37efd504f05d9a08944058be1245ea7c

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