Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cdcca2525cc7269…

MALICIOUS

PDF

69.5 KB Created: 2021-09-18 13:57:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: deba111fe325013b5caff2483bf3c661 SHA-1: 4ca23c5ec3c9af516e74230bcb7020a554750f3e SHA-256: 5cdcca2525cc72694deb4bd50594cae750a84592ce29103b17842fd518a7c826
126 Risk Score

Malware Insights

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

The file is a PDF that contains a large number of embedded links, many of which point to disposable domains and are used in a link farm configuration. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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=kotlin+sqlite+database
    • http://quartierdete.fr/uploads/fckeditor/file/51288867281.pdf
    • http://joomlacode.org/fckeditor/editor/filemanager/img.php?file=file/legitamofobu.pdf
    • http://centonze-vini.com/userfiles/files/tikugodowexurekejukupula.pdf
    • http://yasairamenbar.com/uploads/files/lemazirudopowusomidejaka.pdf
    • http://cycling-software.com/files/file/41044933425.pdf
    • http://snbedu.com/uploadfile/file///2021091115294838.pdf
    • http://ipai-bg.eu/img/file/raputilurokovenetupusilot.pdf
    • http://af.ssla.ru/images/fornews/files/tajebexekaxakogufatudux.pdf
    • http://tmacfashion.com/ckfinder/userfiles/files/niledixalulolaxiniganonuv.pdf
    • http://www.urbanwaterways.info/files/98182752189.pdf
    • https://bazk.info/public_htmluploads/file/rusivuxijewab.pdf
    • https://dialogueinpraxis.net/files/docs/zogitodejub.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16144361920870---84819411803.pdf
    • http://zartmobilia.com/userfiles/file/20210906073146.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9eef7f245---71937333217.pdf
    • http://bpsstudio.hu/uploads/wijepuzifilinagora.pdf
    • https://chameleoncoupons.com/adgprocessing/uploads/files/46555977391.pdf
    • http://inannamsao.com/uploads/files/bazavofowojevipa.pdf
    • http://antansconstructions.com/ckfinder/userfiles/files/rowejeloj.pdf
    • http://chiron-ventures.com/chiron/home/img/upload/files/210912090801627145o0wzw.pdf
    • http://kursverwaltung.fit-n-essen.ch/ckfinder/userfiles/files/57000949747.pdf
    • https://eguiders.com/uploads/mowifepes.pdf
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/fuvibiziretativ.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_off0000b361.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB361 16792 bytes
font_01_sfnt_off0000cb78.bin
4f18358580ba42c6e851f856fbaaa26be8835fece52c7f9681ce12f494f8b247		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB78 10420 bytes
font_02_sfnt_off0000e2f1.bin
bf40629161aea4f8b5147fb33d3408b16d453e5b82c03f32592b70285cdd3088		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F1 14816 bytes

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