Malicious PDF — malware analysis report

Static analysis result for SHA-256 c11980a39e173e19…

MALICIOUS

PDF

82.1 KB Created: 2021-09-19 12:36:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 65a415bac19fc17ba478d7696026a684 SHA-1: 6d13a418d9825c63e97f799321febc65bdcd4388 SHA-256: c11980a39e173e1981088fc5039d394c2b5e74cf3cfac31530274e3506c16723
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm strategy, and the presence of embedded URLs suggests an attempt to redirect users to malicious sites for phishing or malware delivery. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://allytemp.ru/uplcv?utm_term=reparer+carte+sd+endommag%C3%A9e+android PDF link annotation
    • http://icmasistemas.com/userfiles/files/bofugazodinafobu.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/161375b1387b84---mitotinijaxurufuzorowedi.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/33773101482.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/xunonesipaju.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/redojexumuno.pdfIn PDF document text
    • http://findusafranchise.com/files/files/dibebipo.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/39155611169.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/giridobodab.pdfIn PDF document text
    • http://rulada.by/upload/editor/files/18047386717.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/xajerojofa.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/98952066609.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1612eeca690f43---28268816680.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/51372860435.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/66962053237.pdfIn PDF document text
    • http://kreativitaet-stadlhofer.at/global/images/userfiles/file/51779464248.pdfIn PDF document text
    • http://sakem.org/userfiles/files/gefadufulemufo.pdfIn PDF document text
    • https://kiptep.ru/file/tevaw.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/bunirerow.pdfIn PDF document text
    • http://faptvmedia.com/userfiles/file/53510876795.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/vurafimasu.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/98082032439.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/koxetukatovikas.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/zigewexako.pdfIn PDF document text
    • http://tes-sys.com/uploads/ckfinder/files/20210910/16312440386281.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_off0000d5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD1 19596 bytes
SHA-256: 3f65aabb1d07efd112288d80897b5e7117b9ab7e7ebd7ebf551ac209b865dbfb
font_02_sfnt_off00011f66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F66 11008 bytes
SHA-256: c89f1709209ca43538b4ca2dc54873a91bf1d7b4ac88265f25cc947de31ad765

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