Malicious PDF — malware analysis report

Static analysis result for SHA-256 48c78db746ef5510…

MALICIOUS

PDF

73.3 KB Created: 2021-09-17 06:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3a124558603bc495cee601ddb12f2960 SHA-1: 9c7f85d2fc5f41ae1c92c3d9a0f872f9cfdf8607 SHA-256: 48c78db746ef5510c2a04bd562c04904be6a78ee2578f2f9e9ba02ab94915790
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, preventing a more specific analysis of its immediate lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://metafelix.it/userfiles/files/24626753762.pdf In PDF document text
    • https://www.karelo.com/uploads/File/fotazalebedasinunutoz.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/worawumurawezijifelo.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/4352b52178de6cf9de8968736ad89957/14557553372.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/3351825744.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/11177878138.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/53873359482.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/pekonuxikoluxilu.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/32703353089.pdfIn PDF document text
    • http://itexpertdog.nwoasis.com/upload/files/goxokukegi.pdfIn PDF document text
    • http://confetti-seasons.ru/upload/files/97299807323.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/bejatakuk.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/77191997584.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/83735250118.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/67795313988.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/19637247848.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/pevurenelunaf.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/55052899053.pdfIn PDF document text
    • http://mywymc.com/userfiles/file/40943527057.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141181916780---30249358382.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/gifejuzuz.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/64116763206.pdfIn PDF document text
    • https://aksusu.com/upload/files/49934590690.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=mario+odyssey+iosPDF 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_off0000bfee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFEE 10100 bytes
SHA-256: e6ff97ee809bc7d0f183e827ea0edb7e2db035fd6d8a8956fa978fbc58b451db
font_01_sfnt_off0000d691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD691 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA3 16220 bytes
SHA-256: 8ae6f5a658e060a0a15f805f240a8c73d7612d217aff3b960ebfeb69bc8b6c74

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