Malicious PDF — malware analysis report

Static analysis result for SHA-256 f55c64848912bb09…

MALICIOUS

PDF

83.1 KB Created: 2021-09-19 20:52:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 99b05611fb7b8544c2ad97926485990e SHA-1: d0baec857ef7865c95d63212ab33a9f5dd9285bf SHA-256: f55c64848912bb0920b2f33385f784b571a1a7fd33e5e30a360067b9a4a2d44a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crysiq.ru/uplcv?utm_term=fooled+by+randomness+chapter+summary PDF link annotation
    • http://avs-market.ru/admin/ckfinder/userfiles/files/lubalunijibenitevedarata.pdfIn PDF document text
    • https://kvzriu.org/images/file/17545992125.pdfIn PDF document text
    • http://nincity.de/inline/file/96743923818.pdfIn PDF document text
    • http://hunting.kg/userfiles/file/jejatibusigubedipatenu.pdfIn PDF document text
    • http://dreamscar.eu/userfiles/file/sonagifevumo.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee36dc400f---foxizipawawug.pdfIn PDF document text
    • http://topliving.sk/userfiles/file/tibedolejatizedixobip.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/busidetozigan.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/nonowisegizi.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/53606471004.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613033465c1bc---31123214900.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/nekap.pdfIn PDF document text
    • http://czyxchem.com/upload/files/sekidepegal.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/51992146207.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_off0000de36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64D 11016 bytes
SHA-256: 41ed02cdb76f2c3080cebea8582b83791f9ff793c7808a99de9a90c2f78bc0f2
font_02_sfnt_off00010f86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F86 18368 bytes
SHA-256: 6778329546230e3a8a9ff3f2c6fe7663f67f7d372ed32392c3823b8429208594

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