Malicious PDF — malware analysis report

Static analysis result for SHA-256 80db4ba5316f66c9…

MALICIOUS

PDF

94.3 KB Created: 2021-10-10 15:26:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7b76517dd70e9ae51d6f5a9ef6174dc7 SHA-1: 2104459241cc5b83aef3b2d293cd25b0b938fe09 SHA-256: 80db4ba5316f66c9c4143b78abde984efcc265f0aa1802e80f1061c7028ae777
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. Numerous external URLs were extracted, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=plot+diagram+of+the+most+dangerous+game PDF link annotation
    • http://ed-web.cz/userfilesfile/fubijumukupajome.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/gawajipuzagasopokuwo.pdfIn PDF document text
    • http://rent-lease-no1.com/userfiles/file/20211006165903.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/93839156936.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/86573683338.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/19834408602.pdfIn PDF document text
    • http://cataga.de/beta/files/file/35073258981.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/pobugiwaz.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/89007778220.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/91478685248.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615235d5afc5f---95731479229.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/42825541355.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109132247041984.pdfIn PDF document text
    • https://adci.vn/data/upload/file/45846409249.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16149e7e2ab36a---29485654552.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/jizawet.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/89177585957.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/lobebufevilubuvopo.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/81092925177.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/87907664118.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/90150058751.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/mamapetafilabafaw.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/55111733022.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/xedovojupoxomexugu.pdfIn PDF document text
    • https://10fci.org/userfiles/file/sonododamomokod.pdfIn PDF document text
    • https://riwg.in/userfiles/file/varijepugavokonugu.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_off0001091c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091C 10904 bytes
SHA-256: e9ff1a3429ccef1b70fe4d45bfd31337a22411bd44766e97c5e467054137a1c0
font_01_sfnt_off000121eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121EB 18884 bytes
SHA-256: 97114efbd317693c0a26d0b08b7931fb66d0df3def44630d3d30eecc210b7429
font_02_sfnt_off000152eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1