Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2c94d99dc1664d9…

MALICIOUS

PDF

81.7 KB Created: 2021-09-18 02:19:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f0a1eb8b3bbb3a5bcfdd1d2cd9ef3b65 SHA-1: c036dc1efd1ddaba776450f5118e76672ec078d2 SHA-256: c2c94d99dc1664d9f3a8fb270c3146ec7dd9ce5ecf732820680bee1a07f3a70c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged by ML classifiers and ClamAV as malicious. It also functions as a link farm, directing users to numerous external URLs hosted on disposable domains, which is a common tactic for phishing or distributing further malware. The presence of JavaScript suggests an attempt to execute malicious code upon opening.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://catamma.ru/uplcv?utm_term=minecraft+pe+apk+2018 PDF link annotation
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/21893289083.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/nidafulitakelozovoranimit.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/14837378948.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/e3b14e21ab2b2c583639ad514c076687/1804554355.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/juguwesenonexemetojilat.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/remopadufotoxevezajoz.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/76445694732.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210917_748BD087A6B00E12.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/3190081569.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/bimakuvujaxukatalusuzunux.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///repodo.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/tizire.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/97482216475.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/65660715906.pdfIn PDF document text
    • http://chipgene.com/image/files/20210909_135016.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/wunukoridakut.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/gusogunofopoduto.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/20700492744.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/71750324158.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/kabaliwiruxibetidese.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/magogelawikabuwi.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/41849888776.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/30513808230.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/losanupowifewisum.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_off0000da45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA45 17028 bytes
SHA-256: fa4c3114baa3475124514b4fd2d91b2aa6cef031c6131617096aa51768578d27
font_01_sfnt_off0001067a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067A 10724 bytes
SHA-256: 85a60a42b570d58967e7f03254bb3057295ff75007dfe35cfa4607333f8445ad
font_02_sfnt_off00011f60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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