Malicious PDF — malware analysis report

Static analysis result for SHA-256 931938b48a4d5739…

MALICIOUS

PDF

71.9 KB Created: 2021-10-01 18:43:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1acb3faaf7430138809ced44389000bc SHA-1: 12ef8a16ca73ae8040ffdc706abda1a9a20e10d8 SHA-256: 931938b48a4d573928900e4189e849473e6ab68362a518a32f0db9e2f157d9b0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, suggesting the primary purpose is to direct users to potentially malicious sites. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 6

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=video+for+wallpaper+pc
    • https://anitt.in/ckfinder/userfiles/files/6663278179.pdf
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/poloxemiweb.pdf
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/bufosaberokebaxozol.pdf
    • http://alvit-bk.ru/userfiles/file/kojirojimijitafekujikuzi.pdf
    • https://propertiproperty.com/Uploads/userfiles/files/puvexokeg.pdf
    • https://lekkermooi.nl/userfiles/file/vatukasapobo.pdf
    • https://soswzgierz.pl/web/uploads/files/warolit.pdf
    • http://yuemeism.com/uploadfiles/files/21400313024.pdf
    • https://johanbjerke.se/userfiles/file/venodem.pdf
    • http://ehomerealestate.org/images/file/simuxofuxivajuzerajolukop.pdf
    • http://goldenagegroup.vip/userfiles/file/26630288996.pdf
    • http://odontotecnicacoop.it/userfiles/file/32346673340.pdf
    • https://veterinarycarefoundation.org/userfiles/file/77264367033.pdf
    • http://happinessgown.com/upload/users/files/silitilesitetex.pdf
    • https://kapefashion.com/files/files/65562397810.pdf
    • http://poketomecam.com/uploads/files/9997980317.pdf
    • https://kysig.com/app/webroot/userfiles/files/wujekumowetawanubisifojex.pdf
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/82028074956.pdf
    • http://amirafouad.com/uploaded_files/file/moxavuzevisabanuzaro.pdf
    • http://taketty.xyz/js/ckfinder/userfiles/files/riwubavaxanipizubinewobi.pdf
    • http://popmetre.com/news/files/95109499486.pdf
    • http://alwaditrading.com/userfiles/files/99367638605.pdf
    • http://willbramephotography.com/84382225460.pdf
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/48982889451.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/l38qolnihpeesqrtn2psoteopm/zosanorekuzumemuwebarufu.pdf
    • http://greathorserider.com/ckfinder/userfiles/files/lebesam.pdf
    • http://czechnews.cz/userfiles/files/kajamoroguvarefosuvino.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_off0000b61f.bin
9d85162d420c9e8e15e1a04f247921ac2b51b60bbc3a059b267114959db65cc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB61F 17524 bytes
font_01_sfnt_off0000e252.bin
d9128c4d1b74e4b02f6f100eb78f28623b2aca25aac04d0f912d305b80bbde74		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE252 10300 bytes
font_02_sfnt_off0000f9a2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A2 16792 bytes

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