Malicious PDF — malware analysis report

Static analysis result for SHA-256 202b196eeb624494…

MALICIOUS

PDF

79.6 KB Created: 2021-09-12 07:58:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3fa6bc7121c5af7999d43cf62562281f SHA-1: db36568a96f2768ebeed3154f628c1ac3e18ff32 SHA-256: 202b196eeb62449472ce6fd084560b904dbbb7f2fa85b2a5f5c9b73e36a45751
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was classified as malicious by an ML model and detected by ClamAV as a phishing trojan. It contains numerous embedded URLs, many of which point to suspicious domains and are part of a link farm, indicating a likely phishing or malware distribution attempt. The PDF structure itself is also indicative of malicious intent, as suggested by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9600

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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 http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/jigok.pdf In PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/25153394130.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/xunavesek.pdfIn PDF document text
    • http://standdominica.org/files/files/76212057653.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/winajileguwakuj.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/68823907454.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/vuwizatipozamelilemason.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/050222126020.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/zojomitosabedijokugefiz.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/95081165995.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea37277f92---84748933581.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/40852132502.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/35216280639.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/16290590083.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/vonivupaxe.pdfIn PDF document text
    • http://lgassociates.in/uploads/16256259955.pdfIn PDF document text
    • http://okgwa.net/50/files1/file/99852994690.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/18003919268.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/45146734993.pdfIn PDF document text
    • http://tzsunup.com/upload/13184444277.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/xitup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=network+layers+and+protocolsPDF link annotation
    • 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_off0000dc3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF454 10684 bytes
SHA-256: 1ca4044947b818e5c227979dcb7c3066aa9c7cded1ef779bb69cac56362395be
font_02_sfnt_off00010d10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D10 17260 bytes
SHA-256: 77249d49d89cc9c7c893270807fb7e332f260cd7603ca8b1254830a87522e741

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