Malicious PDF — malware analysis report

Static analysis result for SHA-256 f196f7b36b4763b2…

MALICIOUS

PDF

70.6 KB Created: 2021-09-27 15:09:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 452ab3d80c1cabadfbcbef1d175d2386 SHA-1: d3efaf5200643d1284d7f774b48d182965b82b40 SHA-256: f196f7b36b4763b290705b798c355c3d01dcff992fa8e47b8240b080a8e89feb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous external URIs, many pointing to disposable hosting and employing UTM parameters, strongly suggests a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://laborke.ru/uplcv?utm_term=install+app+on+genymotion
    • http://denge.aero/upload/files/77537300640.pdf
    • https://wodepcb.cn/uploadfiles/files/15296018915.pdf
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/vitaridig.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe7670ba22---71234228366.pdf
    • http://brickchamber.com/ckfinder/userfiles/files/14402185544.pdf
    • http://saiprogetti.net/userfiles/files/bomatut.pdf
    • https://uat-tunisia.com/userfiles/file/rolufujusiraweti.pdf
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/ruzemidatomuxupolapi.pdf
    • http://orderkai.com/uploads/files/91495827977.pdf
    • http://fujavietnam.com/images/Download/fotutu.pdf
    • http://yetisirkaucuk.com/firma/files/22342947917.pdf
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/rerig.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613faea702133---pafegeb.pdf
    • https://larustt.com/upload/ckfinder/files/25838358344.pdf
    • https://chorland-dining.com/webroot/editor-uploads/files/mowifixodikoset.pdf
    • http://eltdb.com/UserFiles/files/takumekedapuvaxilamadel.pdf
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/duvuvanifar.pdf
    • http://speckrepej.com/upload/file/safiperonikojudebokekili.pdf
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/28851072284.pdf
    • http://uhy-th.com/image/upload/files/94799002915.pdf
    • https://serwisnawigacji.pl/userfiles/file/karijejobotiwitoka.pdf
    • http://autoservizimensi.it/images/fck/file/potikaburanowijojum.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_off0000b109.bin
ebab31dfc43946b73f74398e6b4ef57084d88647c74f197a10e5f0e23e768af2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB109 10560 bytes
font_01_sfnt_off0000c91f.bin
d185bce9dbd99a4e26b67bc62c6ba497ef001b7f6d90d562f2d11f2718f7df53		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC91F 16936 bytes
font_02_sfnt_off0000f4ec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EC 16792 bytes

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