Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0f72dc276444089…

MALICIOUS

PDF

76.2 KB Created: 2021-09-27 19:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 0785a380001f2e3fdeb5423e641c960d SHA-1: 68df93e3345cc4f16e49ae2178664a9e26b6dd47 SHA-256: e0f72dc276444089ffff819496a168400d832a4bb109d6aafa8d9e282fb35eaa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by multiple heuristics, including ML classification and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URLs, many of which are embedded and appear to be part of a link farm, suggesting a phishing or scam lure. While no scripts were explicitly extracted, the presence of embedded URLs and the PDF structure point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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=juegos+de+conquistar+paises+android PDF link annotation
    • http://www.logomarcanet.com/userfiles/file/32755966489.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/98768820554.pdfIn PDF document text
    • http://instalater-macecek.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/filarumimikimewitinepe.pdfIn PDF document text
    • http://tctrack.vn/images/newtech/files/55410427739.pdfIn PDF document text
    • http://fukaofoods.tw/uploads/files/202109132351349901.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/rulum.pdfIn PDF document text
    • http://esejsc.com/upload/files/wotidesugabemebavolepidip.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/nonabewotegatake.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/9259548705.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/laguvewopot.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/97536113931.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/jomegup.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/taxanugodu.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/naxideluzuraduzu.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/beraxofobenujunapux.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/lakevupek.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021092201353173.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/1040da145a525226adb9cc1034c01d06/25177187211.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/90342661831.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/45881352362.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_off0000bd94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A6 19648 bytes
SHA-256: 31fdbba663dae716191f1193364ae0a7ace067b4b66201cd1c99057044892016
font_02_sfnt_off000108a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A5 10880 bytes
SHA-256: f608ba1484c43639d625a9f70b3f6aca289063b914d81802cc393aaba9312713

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