Malicious PDF — malware analysis report

Static analysis result for SHA-256 7607ef20d23fd89e…

MALICIOUS

PDF

84.2 KB Created: 2021-10-05 13:55:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: ca8ab8b7ed5c9d78b5f177043d907fda SHA-1: 1710886c7b9541411b823bf75dd23557d7fd5e9c SHA-256: 7607ef20d23fd89ee610787babc0e13ff9557e7c72ad25473d7e612fc2810686
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external links suggests the PDF is used to redirect users to potentially malicious sites, aligning with a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/60662597192.pdf In PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdaacb6728---nagexe.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/87114719385.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/56791658672.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50278206897.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/gixoguvetifutum.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/29426461727.pdfIn PDF document text
    • http://rjt1.org/upload/files/78645132612.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/cc2a53181d044db185c5b928e2b29941/78033608508.pdfIn PDF document text
    • http://venkateshservices.com/uploads/98574030249.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/45775152069.pdfIn PDF document text
    • http://synowka.pl/galeria/file/kifokavarupuwike.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/nukis.pdfIn PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/68298390759.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/jefebame.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/jikiruxeminexi.pdfIn PDF document text
    • https://teater77.nl/userfiles/file/wulege.pdfIn PDF document text
    • http://midesignvn.com/uploads/files/30536633157.pdfIn PDF document text
    • https://trakyasoftavukatwebsitesi.demowebsiteleri.com/upload/files/lafop.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/32734130308.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/rejuzivosera.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/degedijinotij.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/wizurijuxa.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/gidagimitemo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=lower+body+workout+for+weight+lossPDF 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_off0000e4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A8 17888 bytes
SHA-256: 0ce783acda159e1da5fd14e2ba7b2814be6d1fcdce0260ea2a4db0deee2b7ff8
font_01_sfnt_off00011229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11229 10856 bytes
SHA-256: c5320196bcaa7677f067f5e9902336ce586ab16d096125014badb96bfc7ec2e5
font_02_sfnt_off00012b34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1