Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc2a85ecaae32c86…

MALICIOUS

PDF

83.3 KB Created: 2021-09-18 07:30:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 36293869a5fa4763c3c7b7e3534f07fa SHA-1: ee296be95d9b996c4563de10eb23d5103547ca99 SHA-256: dc2a85ecaae32c86ed672c3ef25332601e8534d71673d26c04d1d68c4ced5dd2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://pixomot.ru/uplcv?utm_term=offline+bubble+shooter PDF link annotation
    • http://buyyoutubecomments.com/ci/userfiles/files/pofik.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/35265163165.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e320bc084---48420662818.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/kawujoniguxozagawaxe.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/xagiwulomedizevawesutuso.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/88248687233.pdfIn PDF document text
    • http://sentai.cc/data/file/20210911_084259_997.pdfIn PDF document text
    • https://bagstyle.uz/images/file/38965018974.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/23283830953.pdfIn PDF document text
    • https://digireg.cn/upload/69069889266.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/61578549162.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210905_46F6B89F42B8CE60.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/45922808603.pdfIn PDF document text
    • http://tischtennis-kiel.de/images/file/36739163080.pdfIn PDF document text
    • http://calisnt.com/uploads/files/91977465986.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/92053319.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/jabusizamepajipugi.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/melelalutagaxo.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/32163083877.pdfIn PDF document text
    • http://lapmaymn.samdigroup.vn/app/webroot/upload/files/67189944510.pdfIn PDF document text
    • https://snf.styleguides.ch/userfiles/files/31268873464.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420ad1a00a7---5352873176.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/20992190465.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/21143780362.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/runikifovaroxafat.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/59129465125.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_off0000e309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE309 10412 bytes
SHA-256: f9fd6633db8e36d86414f60c9a8fd9c36e4f0a8a046f9ab270643aca4e004f14
font_01_sfnt_off0000fa8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8B 17480 bytes
SHA-256: 76bf58df60e6427509e93c5da84b637208289b5c3083073efd9e86816cca951c
font_02_sfnt_off000127fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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