Malicious PDF — malware analysis report

Static analysis result for SHA-256 6723ca4fb7bd28af…

MALICIOUS

PDF

83.2 KB Created: 2021-09-13 14:22:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6530cd023cb2a8c42105dcf9d081a6fb SHA-1: afab933eb2bcd4286eaec285f4ab153df495188f SHA-256: 6723ca4fb7bd28af5ef0f283d60910c694074195b3144bad62468aa55b84dfee
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The PDF structure itself is also flagged as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=newt+maze+runner
    • http://karthikeyanjayaram.com/userfiles/file/24974060095.pdf
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/levusifukewufulenavez.pdf
    • http://ppfi-online.com/userfiles/file/lemofewezivoz.pdf
    • http://pedraferro.com/files/files/bifolig.pdf
    • http://benthanhsgfarm.com/images/uploads/files/89163396524.pdf
    • http://lnhaihui.com/userfiles/file/20210908043640_1698448103.pdf
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/kekisonozaluluxoxe.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/1059dab80b56aecbc2b12e3d515a9d4f/26830098668.pdf
    • http://studiobonvino.com/userfiles/files/59246980389.pdf
    • https://castilloexterior.org/ckfinder/userfiles/files/39249494296.pdf
    • http://geojeoceanhotel.com/userfiles/file/20210906023104.pdf
    • http://31kouqiang.com/userfiles/file/1630826835.pdf
    • http://kaztelcom.kz/ckfinder/userfiles/files/dixajugabanobilebesisoj.pdf
    • http://studiosiciliani.eu/userfiles/files/rixixurifixug.pdf
    • http://feuerwehr-mittenwalde.de/mediathek/files/gunorutavafutavevinaraku.pdf
    • https://justforjetscatering.com/userfiles/image/files/992954005.pdf
    • http://filipdegreef.be/uploads/files/82228175938.pdf
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/18239587944.pdf
    • http://normel.org/files/upload/file/95104092597.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613e573b788e7---94561827219.pdf
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/97190956831.pdf
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/46350511750.pdf
    • http://hanabi-la.com/uploads/files/38430033776.pdf
    • http://fractinvest.com/uploads/file/78509883814.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_off0000e153.bin
9dc959d1f9cde8074a9889643ea687f4396b58ce54c1839ddf7044545b1955c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE153 18376 bytes
font_01_sfnt_off00011103.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11103 16792 bytes
font_02_sfnt_off0001291a.bin
55436858b92822f65a39562baec556033750da8685a98e323fcab98425cb01e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1291A 10068 bytes

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