Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7668fb01e942956…

MALICIOUS

PDF

80.8 KB Created: 2021-09-17 06:17:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d2a73ad819fe6c9fb9550f974b67d3e4 SHA-1: 74bb1703bb031c01ea7a0a82ad73eda502dd35fd SHA-256: d7668fb01e942956842c25e99ea668e77924dbc20dfe3abc0d4f4d8055ae0241
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm on disposable hosting, with numerous external URIs pointing to potentially malicious sites. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://synerhu.ru/uplcv?utm_term=obs+use+phone+as+camera
    • http://opuspoint.com/ckfinder/userfiles/files/mosiwodilaseninosik.pdf
    • https://marblobaths.ph/app/webroot/img/files/20958453791.pdf
    • http://kancelaria-perfect.pl/app/webroot/media/files/gozazekisemeregatefijob.pdf
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/4375485521.pdf
    • http://ctnphrae.com/ckfinder/userfiles/files/64240905022.pdf
    • http://weforyou.it/userfiles/files/musopuwaxego.pdf
    • http://domexpo.ru/up/file/28303653098.pdf
    • http://giaydantuongphongkhach.net/images/news/file/61898162573.pdf
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/52188060189.pdf
    • http://pop-around.com/file_media/file_image/file/bovevavevofux.pdf
    • http://gutachterbewertung.de/userfiles/file/pipibuvase.pdf
    • http://tpt.taipei/asset/uploads/files/jofibuvanubomajaseje.pdf
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/77351589396.pdf
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/voweru.pdf
    • https://solucionaesp.com/ckfinder/userfiles/files/9124560278.pdf
    • https://melz-feu.ru/upload/nonogaj.pdf
    • https://marblobathware.com/app/webroot/img/files/48085072357.pdf
    • https://marblobath.com/app/webroot/img/files/14271769021.pdf
    • https://kolbandibileklik.com/resimler/files/22705155413.pdf
    • https://paidionresearch.com/userfiles/files/woregejefaxavi.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16143eaf05ac4a---vajesubanejuludakux.pdf
    • 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_off0000d455.bin
7697bb604de1cdb3f9d2af63a7fd034520e7e836e2057c375a99596c8ee375c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD455 10668 bytes
font_01_sfnt_off0000ec59.bin
291412577a3879119cc1d7c00deb1c9f417d06d1ac7e06f790c1f24b79bdbe90		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC59 19164 bytes
font_02_sfnt_off00011d97.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D97 16792 bytes

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