Malicious PDF — malware analysis report

Static analysis result for SHA-256 f95bef950de07c72…

MALICIOUS

PDF

72.1 KB Created: 2021-10-02 23:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bd543b8c05e79c584786be0b997cc8b8 SHA-1: 11d287e6f74ed5c3fefa0c8ccb7e78c15a0a40e7 SHA-256: f95bef950de07c729139668ebc22d9202a8bb7c31d3607b5fd8780624092d677
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://archism.ru/uplcv?utm_term=photographic+unsharpness+radiography PDF link annotation
    • https://asiahealth.standrewsdentalsurgeons.com/ckfinder/userfiles/files/xorasobises.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/4012530381.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/wawuxudakonasirofapeli.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/14701812776.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/tulofifepal.pdfIn PDF document text
    • http://findusafranchise.com/files/files/27965334051.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b69e624e2c---97314678871.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210915_211516.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/suxifixatamosuxaruxepigu.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/11344972529.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/86478299038.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/xipesuxareneko.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/motixasemugewivajutupi.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/nowaxixibeliroxorozet.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210928052245_bsemmb.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/77338071818.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/wejesifuxefisudoboletiku.pdfIn PDF document text
    • https://curtain.jinware.com/upload/files/40028580979.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3f5138b7e---22290097805.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/fozadi.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/mirifo.pdfIn PDF document text
    • http://zeamailer.zeapost.com/FCKeditor/editor/filemanager/connectors/userfiles/file/96288428799.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/fanolefusiminipozupavupu.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_off0000b270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB270 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA87 10964 bytes
SHA-256: c30b58d2c3ea1111c7f8484272df51e9aaef4e3811b0c3c8cab9e151d2a436c5
font_02_sfnt_off0000e3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CD 17604 bytes
SHA-256: 2f32c82803adc7ca5cb13b08538124ea0089ccef0089a52934837273a923e2a9