Malicious PDF — malware analysis report

Static analysis result for SHA-256 8227952d4e72922f…

MALICIOUS

PDF

80.1 KB Created: 2021-09-19 11:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e19fbf60e725440759c9c04f3ff7e9ae SHA-1: fac1c43ff4f35018f301d248e4979b26d024f456 SHA-256: 8227952d4e72922f4f058d537831b7ecbede7f773758f304560bfc1cdaf61fd5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous embedded URLs suggest the document is designed to redirect users to potentially harmful websites, possibly for phishing or to download further malware. While no scripts were explicitly extracted, the PDF structure itself contains links that are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=how+can+you+earn+pokecoins+in+pokemon+go PDF link annotation
    • https://vinocastillo.hu/editor_up/doxewavuvova.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/bupevapejo.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/46352048412.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/lubawitibatu.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/86593761004.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/56375279757.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/muliduzujuzufezasinowipet.pdfIn PDF document text
    • https://senfina.top/uploads/files/22937310715.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/54043973268.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/35102395350.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/87216025604.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/jenuvitevuxefitaxabefuxa.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/kiniromelazepunedivig.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/87421393708.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/77592442890.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcf63d2805---48586563975.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/20616132170.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/41657478812.pdfIn PDF document text
    • http://newshop.jp/archive/file/73511511376.pdfIn PDF document text
    • http://albertf.madteam.net/ckfinder/userfiles/files/wonepegalagudozesukowavo.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/0781183cde7f040052549681579451df/lorelemutarilaponomelanuk.pdfIn PDF document text
    • http://medicom.pl/userfiles/file/733381647.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/rikijovodokifijuje.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_off0000d334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD334 17592 bytes
SHA-256: 07ee1bace53ee0f3b7f9f2315e4daf19b78f6569c6167c16a73bab61582a5749
font_01_sfnt_off000100c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DF 10956 bytes
SHA-256: 7e542b86aa1d4025b02c18d892af8f56978d2f63dcdd075cec9a30ff07d597a4

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