Malicious PDF — malware analysis report

Static analysis result for SHA-256 f583484497640075…

MALICIOUS

PDF

69.5 KB Created: 2021-09-25 19:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cd1efdbca5060780b49c8cdc3c773141 SHA-1: 3733a84fb0b6f59a0e03eb7f84d34b724c016515 SHA-256: f58348449764007584160d0568d461c061e8e77f6bf2fac834af065713c5ea57
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including one that appears to be a lure for downloading game-related files. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to the malicious URL, which in turn serves as a lure for downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=garena+free+fire+obb+download PDF link annotation
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614716a86b5d1---75235008800.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/52807843358.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/98683742452.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/xenikasuwemibobadofexuv.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/fajavu.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613f854207a18---dejowab.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/80137133665.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/vukomejorone.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/wobajutaze.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/timesukutizawog.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/67810588329.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/turajojekadupodiditunefe.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/kunadiwuxum.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/46106141019.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/94935129080.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/67003288460.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/kisulefotipede.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/xakezagumavujenutir.pdfIn PDF document text
    • https://premium-house.uz/images/file/pobaxad.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/fudojodo.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/96063394344.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/95087881903.pdfIn PDF document text
    • http://everintelconsulting.com/upload/file/202109091333010084.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/gogewaxujijaxixoxuv.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_off0000b036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB036 10348 bytes
SHA-256: 288a7d55155678630f06dae78475586aef3f2033aa7acda42dc893d11a040633
font_01_sfnt_off0000c7ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7AD 16472 bytes
SHA-256: fbe1796c71ac500fa14414e1781eb63e3f08cc5069a3b957ee2827ca2218d86f
font_02_sfnt_off0000f099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF099 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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