Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd0d0597e43a6db2…

MALICIOUS

PDF

71.1 KB Created: 2021-09-27 00:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 94a3241a38d7fcbcb3dd994e684877ac SHA-1: f058c552bf7200da39d96b7ea3d641ed63d46629 SHA-256: cd0d0597e43a6db225dc82d9bdefbaee5204808064a6cc1211864b451dacf3b8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content, likely as part of a spearphishing campaign.

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 http://files.ibiza-ferien.de/file/rujegupefover.pdf In PDF document text
    • http://ceresasrl.it/userfiles/files/55408786758.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/72174565904.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/93711729363.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/23942295553.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/81784394031.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/41052689467.pdfIn PDF document text
    • https://indianhairtransplant.com/ckfinder/userfiles/files/91558825054.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/4409051856.pdfIn PDF document text
    • https://cabinetscounters.com/ckfinder/userfiles/files/wafadisaferawavu.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/58077639509.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/fotopapaxis.pdfIn PDF document text
    • http://nakakinpump.kr/fckeditor/upload/file/11073542599.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/74946641170.pdfIn PDF document text
    • http://wingtsunkungfu.ro/imagini_ws/43965695671.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/foxirajazem.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/88632873772.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/nivejoretudoniruw.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/nalagokajuxetopu.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/ximujixajakewawiduvumebul.pdfIn PDF document text
    • http://klpa.net/userData/board/file/figebeze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=pes+club+manager+play+storePDF 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_off0000af31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF31 17744 bytes
SHA-256: 0f3c5ab1be3fbbc426a52512b325762308d5c8be039d66e1d3a33d070eef1a7d
font_01_sfnt_off0000dc45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45C 10980 bytes
SHA-256: 1b31d76638b181d5f9e05ee8a9701ef0eec5f3b1601de12b064118e41a6dd108

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