Malicious PDF — malware analysis report

Static analysis result for SHA-256 814f3c87cf31eb5f…

MALICIOUS

PDF

70.5 KB Created: 2021-09-24 14:42:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4a0c917a3219292886495da0b4ee8374 SHA-1: 57b25e868a4917d2dcf51827fcdceab7b8865864 SHA-256: 814f3c87cf31eb5fcc6b8b466e44a665b20c4fccfde3da7aaf03068230ff388a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable hosting and employing UTM parameters, suggests a phishing or link-farming scheme. While no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://coretry.ru/uplcv?utm_term=tango+free+video+call+and+chat+download+iphone PDF link annotation
    • http://bresky.cz/res/file/nanegoponopajefewuzufez.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613da81411e4e---pedas.pdfIn PDF document text
    • http://wamer.org/userfiles/file/66674274474.pdfIn PDF document text
    • http://kasand.com/userfiles/29276594734.pdfIn PDF document text
    • http://hmed.vn/upload/files/nawavuvu.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/tezegafarov.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/likaxidixelilimetadeba.pdfIn PDF document text
    • http://patrickstaxi.fr/userfiles/file/26346360934.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/dipesopafawuruk.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/73532821272.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/33148372678.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/76695291234.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/xulipukuwirukinun.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/bezabowixetijoji.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/69880709016.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/72756509475.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/ovrbm4f419eab4dlnhpn613hf1/riranavigutuliki.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/xumolewumemax.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/xogugejenejimirup.pdfIn PDF document text
    • http://robvancampen.nl/userfiles/file/sojigamigafuve.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/poduju.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/kegobiridenavozu.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/25984283849.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/gufonepetoku.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/lesaxuvupapizovubobovur.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_off0000b047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB047 10844 bytes
SHA-256: 35065dc0e6a594eb7f49bdb2a6a31c4e0b0ea924a7def9a2be0b62324da2fbe7
font_01_sfnt_off0000c91c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC91C 16272 bytes
SHA-256: c5499a8ded6c651c4d91b9892c922883aebb214ee1d19c51ea337b977e67f21d
font_02_sfnt_off0000f239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF239 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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