Malicious PDF — malware analysis report

Static analysis result for SHA-256 897cf2490603968c…

MALICIOUS

PDF

78.5 KB Created: 2021-09-17 00:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0c77fe508be899f1fcf79f96328d7b8d SHA-1: a1d4090415b4e14f893836d58b2cf6bf89866a0a SHA-256: 897cf2490603968cd03241aa475f818d80efadbdfba06024cb98ea734eddc38b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for distributing malware or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://cructi.ru/uplcv?utm_term=iphone+icons+for+android PDF link annotation
    • http://dentistturkey.com/image/files/geginixafurusalunuka.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/51099503693.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/13566299738.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/75345832690.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/82161184368.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/37174467357.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/kagofamaduto.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/penoket.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/merovitifomo.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/53048873304.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/54722540301.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0a7e613d3---zejumamapatagigisuluzobik.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/69796863758.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/82311263176.pdfIn PDF document text
    • https://almavilag.hu/files/files/wimoliki.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/75165075832.pdfIn PDF document text
    • http://lifebeachvilla.com/uploads/image/files/10055148204.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-14/images/files/posogejipigu.pdfIn PDF document text
    • http://gemcom.org/userfiles/file/rurarajefimosutit.pdfIn PDF document text
    • http://vectorma.ru/uploads/assets/file/18626008003.pdfIn PDF document text
    • http://nabisori.com/userfiles/file/tazodaf.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/12549146697.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_off0000ca36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA36 19360 bytes
SHA-256: 8936771cd181b36495ae6022777f626776e9a4daf9e70609e3b2cd37ff34b46c
font_01_sfnt_off0000fc8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A2 10524 bytes
SHA-256: 6c6b51a3b4562c51e738840359f55ebc384c9af79c34b3e426e082513fee9334

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