Malicious PDF — malware analysis report

Static analysis result for SHA-256 520423e50b27e4c7…

MALICIOUS

PDF

99.1 KB Created: 2021-09-08 19:24:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5d283d645b6e42834a2184846e709648 SHA-1: f5350ad1649f12a4a493686afa314df64adeec73 SHA-256: 520423e50b27e4c77652d88ab83126437b0952a0c337504476051910a81993c6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious content. The presence of numerous external URIs, many pointing to disposable hosting and employing UTM parameters, strongly suggests a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://ketchas.ru/uplcv?utm_term=the+maximum+surveillance+society+pdf PDF link annotation
    • https://bitree.ru/ckfinder/userfiles/files/wivalafarodez.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/gafufiputesa.pdfIn PDF document text
    • http://iuoooo.com/filespath/files/20210901042809.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/wesetobilogak.pdfIn PDF document text
    • http://gewidor-gmbh.de/uploads/files/pogimeselonugofiz.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/fomadiwisitilufujusasate.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/fofitimetove.pdfIn PDF document text
    • http://video-cycling.de/files/file/pikeponozosesudo.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/punurogil.pdfIn PDF document text
    • https://dafelia.com/files/mojakonibakuperilebubapix.pdfIn PDF document text
    • https://retta-bg.com/userfiles/61462354694.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/99470872113.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/94385177646.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/modosumukajazikotumobaj.pdfIn PDF document text
    • http://gulfcoastlist.com/userfiles/file/tifipenetapewilotabube.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/4938057f53aa8667c75d4e65f335ab65/nekukiwapoxomuge.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/pexizurumig.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/81082313098.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/tuburaxal.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613064fea4a90---nowoxafabuguwawije.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/78944355749.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210903_141316.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/furilamupudumajema.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/laruxukosajudebebatu.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_off00011d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7F 11232 bytes
SHA-256: d473544ef97b77f92067895838c12da263ea568f58a41d22d0b8ad292ad4ccd2
font_01_sfnt_off000137ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137AB 18440 bytes
SHA-256: ba7b69bcac9e57f4d898c80f59331f181b1d71dccc63ff79dbc951c4dfc76bb4
font_02_sfnt_off00016724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16724 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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