Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aef63ff58feff13…

MALICIOUS

PDF

70.7 KB Created: 2021-10-03 09:45:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 083e0c9cf1aea55d86e1a9eb84a294a8 SHA-1: fe3658974982c9ab2ef9bbd908b1936b46f46eb3 SHA-256: 1aef63ff58feff13f59a62a1aed2fa040ae363d023a62c1343c10a0e5c761853
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links, likely to redirect users to malicious sites. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attack pattern involving the distribution of malicious content via linked websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://accesoriosalmayor.com/images/userfiles/file/42974327077.pdf
    • http://avvocatogiuliani.it/userfiles/files/lejel.pdf
    • http://ykzn8.com/upfiles/editor/files/xibenitoziwasexurikupi.pdf
    • http://www.edgartownschool.net/uploads/files/vesikevatomuxazawazaxila.pdf
    • http://archi1919.com/smlclub-files/file/46362861306.pdf
    • http://poketomecam.com/uploads/files/56300736186.pdf
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/damadabejuve.pdf
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/kukiripido.pdf
    • http://topstec.com/d/files/pelinazapanusof.pdf
    • https://vetamblj.si/ckfinder/userfiles/files/89575463074.pdf
    • http://moretonassets.net/userfiles/rulereweropejosegitutaj.pdf
    • http://mevlanaasm.com/resimler/files/fefepefumejilerujejug.pdf
    • http://blueleaves.ru/userfiles/file/fetuw.pdf
    • http://parcroyale.hk/userfiles/koduzosudus.pdf
    • https://anandamsanyal.com/userfiles/file/visulusalujiwokop.pdf
    • https://morganmethod.com/ci/userfiles/files/82204492786.pdf
    • https://menuiserie-sainte-anne.fr/userfiles/file/10245272477.pdf
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/xidefarafilodateleka.pdf
    • http://studiogallerani.it/userfiles/files/63183836234.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16141639e2232c---fepepiginu.pdf
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/41907703668.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=3d+mouse+pointers+for+windows+10+free+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad78.bin
7ef7a5a072673ab13fcf9f251346868961ec3555baa0e9214f89c2743625f341		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD78 11096 bytes
font_01_sfnt_off0000c761.bin
c4f498ac675ab0be5534d9e067d84717704b6465114c23441d0d11fcadc03dde		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC761 17268 bytes
font_02_sfnt_off0000f351.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF351 16792 bytes

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