Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1d61d4103502345…

MALICIOUS

PDF

69.0 KB Created: 2021-09-28 09:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ed7dd864b9aea66e988b6c27c6d4fff5 SHA-1: 07b9fbb208ab93dcf1bc69142199ca3b2e4de906 SHA-256: a1d61d4103502345568a9ae9701a2e4fb4fb9e03747f7be3bfe65f784d78bd3b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, including one pointing to 'crysiq.ru', suggesting a phishing or malware distribution attempt. The PDF structure and embedded content indicate it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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=chrome+os+download+2020 PDF link annotation
    • http://karimeh.com/public/userfiles/file/mawepusuzadafanugezu.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/18109287794.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/2109250513296886999sgnt2.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/rukukuxobojo.pdfIn PDF document text
    • http://traktor-tv.de/sites/default/files/file/kidipibatasexutuwil.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86036041994.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/84461056675.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/dezap.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/vuzavifadufuleveni.pdfIn PDF document text
    • https://phunhai.net/upload/files/raxulososekinixagowijofew.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/vekobeki.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614e3b4185fdc---74795971168.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109120423116296.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/67644960355.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/nedabukalinenajileturof.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/18034863473.pdfIn PDF document text
    • http://dolaninsurancetx.com/customcms/uploads/files/43069409625.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/57162562441.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/8152611019.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/52103461982.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/mabimu.pdfIn PDF document text
    • http://ilkemymm.com/image/files/sadamowalewudeva.pdfIn PDF document text
    • http://glttek.com/userfiles/file/tozuwagel.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_off0000ae26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC63D 10684 bytes
SHA-256: 51e5b78d3d374d80e57e3554b4b5ee38842e26f61244e7fe363def6cbde3ebab
font_02_sfnt_off0000deb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB3 15712 bytes
SHA-256: 42d4591fc80849413832d629e987c0b37c44498db33c587a9894cef5625da1ac

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