Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec6fc07f69bf3b3a…

MALICIOUS

PDF

83.6 KB Created: 2021-09-18 10:16:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 22b7a51fae772627b20c2120268fcb51 SHA-1: b178780ea888999fc06c7597cbc3557168d125ed SHA-256: ec6fc07f69bf3b3a53f14b602dee4a1117df49526c030b0a3edc503ea6c8e6ed
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users. The PDF also acts as a link farm, directing users to numerous external URLs, many of which are hosted on disposable domains. This behavior, combined with ClamAV detection as 'Pdf.Phishing.Trojan', strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=android+medication+reminder+app PDF link annotation
    • http://holidayservicemarsala.it/userfiles/files/makoxenexisu.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/bikajimimisexixixuma.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/64338715321.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/82210934814.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/zudojezadeligalulamun.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/14152567805.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/37360402336.pdfIn PDF document text
    • http://twilaw.com/files/files/libelosilufadilen.pdfIn PDF document text
    • http://sissonne.hu/editor_up/dunaposerasomakilujajexos.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136694d5d4c5---rikunaremulixesamitexu.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/peluneloguwidakeso.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210918_6D7A35813A75DEF3.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/vamuduwajetodoxe.pdfIn PDF document text
    • http://willbramephotography.com/65252701274.pdfIn PDF document text
    • http://mmsmarin.com/imgimage/file/70226895322.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/jozurulaxo.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/sarazukarivelutoba.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/volasujegadunodowo.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/xedof.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/kuguduxiparomezura.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/62631508271.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/jolewo.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/el8v2o22p9hrlqqo4ahtc5megs/83499269392.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_off0000e364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE364 10444 bytes
SHA-256: 3ac0140ebb393775088592c8f364f7a51b3aa65211e8a3791561bdace7426110
font_01_sfnt_off0000fb07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB07 17384 bytes
SHA-256: 07b865957ac90563df14f189f03b1a1396dd573640d0c635f444edc1d0ab59a6
font_02_sfnt_off00012853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12853 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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