Malicious PDF — malware analysis report

Static analysis result for SHA-256 d69828b20b0e2c73…

MALICIOUS

PDF

68.1 KB Created: 2021-09-27 20:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 76a1ecc1d3fba6adcf46476b33dccaa3 SHA-1: 4bc1bf412055d29e308d118e654d74371d29f45a SHA-256: d69828b20b0e2c7361e6b452a2b610016171e18ad69dac6aab7c183a4530a03e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable hosting or redirectors, indicating a link farm designed to distribute malicious content or phish users. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=mac+read+qr+code+on+screen PDF link annotation
    • http://chono.mn/uploads/userfiles/files/xodiwatemigigoxunux.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/97498662621.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/sokiwatugavelawetesi.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210911_013844.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/bubupad.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/47723836642.pdfIn PDF document text
    • http://bazoolwddd.specialty-match.com/upload/files/kufiremumepaxikena.pdfIn PDF document text
    • https://camelcarpet.org/d/files/keruxa.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/34658741549.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/81052315167.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/nujidox.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/63847184638.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/xegaxuxulotax.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/vimosise.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/vozonafodejag.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/mexuwetojefezasido.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/92682302045.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/76153930891.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/76060159842.pdfIn PDF document text
    • https://seedcambodia.org/htdocs/cljr/data/files/duzebojabakefuduxuwuref.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090313571373499.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_off0000ac92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A9 10268 bytes
SHA-256: 3e1a3f192f2b3fe424f02d64a5c23e272045b8606ea797d7abfadb375a3203ab
font_02_sfnt_off0000dba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA0 15696 bytes
SHA-256: 4fcfa337e10b85701652c8dc737b93b9bf5f636eacd3f920eff4498a04e7aa09

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