Malicious PDF — malware analysis report

Static analysis result for SHA-256 e900ea191602675a…

MALICIOUS

PDF

68.6 KB Created: 2021-09-29 08:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 811bee186fb6de8f4027c86ec3ec2a31 SHA-1: b50231467af0daedfde5038cbf1cba5aae95591f SHA-256: e900ea191602675a0d9ecebbbf7e8f8a58ef19c6a8f841780146ad41e899b8f3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to external hosting sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farm characteristics suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://vleek.com/uploads/files/81944223216.pdf In PDF document text
    • https://aokman-drive.com/d/files/34618134803.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/govelimo.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/85107339406.pdfIn PDF document text
    • http://nadafashionbelt.com/Uploads/file/61191157821.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/73238857850.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146ec2955efa---zikijajefoges.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/zopanapodolejilol.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145d84994bb6---99288754967.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/29773703186.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/rawugavasuriluvogenomej.pdfIn PDF document text
    • https://tamm.be/_files/file/tuduvame.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/92791440176.pdfIn PDF document text
    • https://ms1oke.com/contents/files/18230245235.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/fomavovijavutudofalabu.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/wurikifugikojosadifuju.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/17772930449.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/nujumi.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/jufekebotuvuvedapamuz.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/supexus.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/86817710238.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/jurelutu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=one+night+at+flumpty%27s+2+apkPDF 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_off0000ac4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC4A 11072 bytes
SHA-256: 0d380415b2eef89ceb8121d4feb94b1995fa09e891487ea249c9349916e13374
font_01_sfnt_off0000c61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC61C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000de2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2E 14992 bytes
SHA-256: 0a3a54a95bf85a66682e4a4e80bc02b6b7ced99d0147dbe26f24426472183c71

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