Malicious PDF — malware analysis report

Static analysis result for SHA-256 c93e47d2f4b8eaad…

MALICIOUS

PDF

81.3 KB Created: 2021-09-17 18:21:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0fec5b29fd73519337f51663f0220df0 SHA-1: b33eddb11e32aa13ef7957ac8843e48290ba91c5 SHA-256: c93e47d2f4b8eaad8c7d9dbd3aef7974a40e42f14cf199191291cd555e9e2cf3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm or hosting malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies the document's structure as a link farm on disposable hosting, reinforcing the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://archism.ru/uplcv?utm_term=free+online+watch+movie+site PDF link annotation
    • http://crystaltrade.hu/data/file/32591262042.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/42971115783.pdfIn PDF document text
    • http://teakdeck.pl/files/file/zesetivaduwef.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/kapozexemado.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/67687197251.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/6182270088.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/98324178583.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/zasiwonududotexoxazuto.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/16390504985.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/36158231617.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613eeeca97dd3---56753589847.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a750ae9e19---89191600255.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/460938457.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/bimanozovotomexu.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/43533397411.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/kaluf.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/90049704201.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/11525700472.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210905081422.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/7671728735.pdfIn PDF document text
    • http://ormansagszive.hu/upload/file/6680885608.pdfIn PDF document text
    • https://atlantidegattico.it/file/2804278353.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_off0000d7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F1 10624 bytes
SHA-256: 07ee368bda59cee7e3fa140fbfa3f1f93a545cdde5948508e9a712db56acd89f
font_01_sfnt_off0000f014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF014 18384 bytes
SHA-256: ca689c1f0be29a724bd7cabc510bfed30e0d70e49172724b4dd000c9614e88a3
font_02_sfnt_off00011fd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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