Malicious PDF — malware analysis report

Static analysis result for SHA-256 6455e3536bd3f320…

MALICIOUS

PDF

82.3 KB Created: 2021-09-10 13:56:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 22526a892baf37dd60f3a28633f5f666 SHA-1: 8ad0d7e94322f1133a89e5445f816c515993fa9c SHA-256: 6455e3536bd3f320679e9b3fea142561079f723c505f4a18fb5f1fb3a8fde3e1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous external URIs and is described as a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the presence of embedded URIs and the nature of the heuristics point towards the document's primary function being to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=gta+sa+skybox+android PDF link annotation
    • http://xutricolor.com/uploadfile/files/11147176264.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/vopegegotowasevusegi.pdfIn PDF document text
    • https://tmtteks.com/files/24174990288.pdfIn PDF document text
    • http://gpp300.fr/userfiles/file/kamuxef.pdfIn PDF document text
    • http://kgmda.com/upload/files/89038015093.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/90821994214.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/bajifipimajiwar.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210903210456796.pdfIn PDF document text
    • http://protok.pro/upload/files/11112194218.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/jigubo.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/56475345901.pdfIn PDF document text
    • http://c-amc.com/upload/files/kenep.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/73217809499.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/62282464976.pdfIn PDF document text
    • http://peter-scherer.de/userfiles/file/bupefixog.pdfIn PDF document text
    • http://186086.com/upload/files/54185689839.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/75443275049.pdfIn PDF document text
    • https://asken.as/bilder/file/65815041582.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/sagot.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4811babbf---teripilizolerufokak.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210903010705.pdfIn PDF document text
    • http://sxsasa.org/images_fck/file/1630870350.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/84667799593.pdfIn PDF document text
    • https://2winit.com/Files/files/ritumitarugag.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_off0000d8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C7 18932 bytes
SHA-256: 32b19cf148b7f0465959e79ed2d1d5de749547f045712d0eea59a248337a31fa
font_01_sfnt_off00010b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001232b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232B 10548 bytes
SHA-256: 9284e73a13ad88a03dd8a11115e80dc9a95426e3d147f461fbda797950c9951d

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