Malicious PDF — malware analysis report

Static analysis result for SHA-256 f24abaed99bffe3a…

MALICIOUS

PDF

72.7 KB Created: 2021-09-27 22:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5b7f3b0d90b0fdb5cac22c29b3bbb2ae SHA-1: 7d8cbb69dbbb9cfa22d86a18e0b5d5fa951e261e SHA-256: f24abaed99bffe3a9b8acd3313bf6cb13d165390640a2ebbfc4f3dce8b6b4c4f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to various domains, many of which are disposable. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 http://www.s-prom.si/fileupload/file/wuladamejepepekisudanap.pdf In PDF document text
    • https://sieuthimaycafe.vn/uploads/file/31695930424.pdfIn PDF document text
    • https://collinite.pl/userfiles/file/44183853253.pdfIn PDF document text
    • http://airsoft1.ro/files/file/gewojole.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/86906555458.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/kalujixut.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/m9h52454q30bmf6e6sgjh0sm47/dikezorinemikakigufanel.pdfIn PDF document text
    • https://maurinet.com/userfiles/file/wapivamak.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/22293090770.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/tubizumezaxuposexuji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=mozart+movie+1984PDF link annotation
    • https://easyown.ddproperty.com/datas/files/vumudilovitesinabu.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_off0000afe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFE9 10576 bytes
SHA-256: 69e3db572c3b7cf9cd8d7c200b4399525b89814d1bc9a196d571e8df3dc4fbd7
font_01_sfnt_off0000c848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC848 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05A 20588 bytes
SHA-256: 04a50febed62d8b3356fdbc19b68c5f7df29b61523e45e86013327896a47d67c

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