Malicious PDF — malware analysis report

Static analysis result for SHA-256 22a7afa4fd7c317a…

MALICIOUS

PDF

94.8 KB Created: 2021-09-11 13:12:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4166019a9fec2bdcad0f99311d6b419b SHA-1: 90e0299f1ca204598dbf46a64103abbc03445ef4 SHA-256: 22a7afa4fd7c317aa6da0ee2ddca3185dccbf9698b853f0743da30e4294159cf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high heuristic score indicating it's part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9879

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://firsatpin.com/calisma2/files/uploads/4707276417.pdf
    • https://nstoplana.rs/ckfinder/userfiles/files/33773101482.pdf
    • http://rklatex.com/userfiles/file/75903054273.pdf
    • https://patoman.ro/ckfinder/userfiles/files/96526953710.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/161316a1e754d3---68150762210.pdf
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/28131872076.pdf
    • http://davidhammerstein.org/userfiles/file/68827419250.pdf
    • http://media-production.net/admin/ckfinder/userfiles/files/92652020673.pdf
    • https://fundacjanadzieja.com/images/wyswig_images/file/95168131081.pdf
    • https://contabil-fiscal.ro/mm/file/28866748738.pdf
    • http://hdurmuslar.com/images_upload/files/41886017541.pdf
    • https://manhremhoangvan.com/wp-content/uploads/files/nimozedeto.pdf
    • http://mistral-paints.cz/userfiles/files/piwozitan.pdf
    • https://hoavily.com/uploads/files/49902963630.pdf
    • http://upnbkk.com/file_media/file_image/file/bobewipopujunozipatisatux.pdf
    • http://stolizstekla.ru/userfiles/file/feluxopatasofij.pdf
    • http://emekyesiltepe.net/images_upload/files/89252096510.pdf
    • https://urbanlivin.lu/userfiles/files/rudexelijamow.pdf
    • https://patc.fr/imagesfile/24741996691.pdf
    • https://cebrium.ssnn.ro/images/bipasovibufitavexozeg.pdf
    • http://acevina.com/webroot/img/files/99674728616.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3d6638680---neletemof.pdf
    • http://bsa.by/ckfinder/userfiles/files/37658219942.pdf
    • http://creativetechno.in/userfiles/file/47193532425.pdf
    • http://uhy-th.com/image/upload/files/kolizabexasivov.pdf
    • http://diakmelo.hu/ckfinder/userfiles/files/goforidalofujuvagezawa.pdf
    • https://cevhertemizlik.com/userfiles/files/kuwob.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=spreadsheet+app+for+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011017.bin
6afc55ec91ac59ddb02dd0af95d17eae8f239399b1ae02df7e595d9c92dc2073		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11017 10624 bytes
font_01_sfnt_off00012844.bin
1ae7ccd12d77110504dd7edbf6b046b50b7ae6a00ee016cffd57abe3ad43163d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12844 17264 bytes
font_02_sfnt_off0001551c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1551C 16792 bytes

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