Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c2aacd621ed45cd…

MALICIOUS

PDF

78.2 KB Created: 2021-09-20 00:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 82b16f6aa4b370612e3d58d803e6ea74 SHA-1: d5c6b9dec69faccb382c5209c75bd708a49f929a SHA-256: 9c2aacd621ed45cd7d2c3c5278d7dc29840b7ad09d9ef05c768f8091849e68ff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The presence of multiple unknown URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • 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://exam11.menapoint.com/app/webroot/upload/files/vidinidewatemejibu.pdf In PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/70508853529.pdfIn PDF document text
    • https://strategieb2b.ca/userfiles/file/41662804863.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/98134692461.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/pobufilovurupuzigokil.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614319c37fb29---30696135377.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/3627693360.pdfIn PDF document text
    • http://longthinhphat.net/uploads/files/33147068410.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/37139165776.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202192030168856.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/lonerurovagoz.pdfIn PDF document text
    • https://softwebstar.com/shop/userfiles/file/tidiwuvamejabok.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109101415465217.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/lipevejobakog.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/vutokalusidafewobuvovep.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/xagitevevepabij.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/8171557662.pdfIn PDF document text
    • http://denge.aero/upload/files/75582071171.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/59387902834.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/43563245523.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/76238586412.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=sniper+3d+assassin+androidPDF link annotation
    • 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_off0000ccc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC9 10488 bytes
SHA-256: 0c20d85c2da2ecf977a43e80e58c848bbbc89cea79e3f7374efbf194b02eb7f1
font_01_sfnt_off0000e4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC3 17996 bytes
SHA-256: 61688aa47f6f50f13b3c6772d3f040a82d2ff29b056ab0b891dd8114d90779dc

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