Malicious PDF — malware analysis report

Static analysis result for SHA-256 15991515a02f6f09…

MALICIOUS

PDF

82.7 KB Created: 2021-09-13 20:23:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a3406d02ea079d3644e12ca873f6a2bc SHA-1: 60b8cc4be761de172acb5d5f8d9cddc26ada0ad5 SHA-256: 15991515a02f6f09e6dd1d8e9ba8a3060a36407795d1d8515026a165b8e04e92
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs and a 'link farm' heuristic suggests the document's primary purpose is to redirect users to potentially harmful websites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/zofapanuguvad.pdf
    • https://beruanglucu.com/contents/files/8116715139.pdf
    • http://80tner.friend-match.com/upload/files/56248501336.pdf
    • http://bertoniamministrazione.it/bertoni/public/file/23495933652.pdf
    • http://joltiy.ru/uploads/files/39112377870.pdf
    • https://guijek.com/userfiles/file/93843276044.pdf
    • http://etcpremium.com/userfiles/files/66242127253.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161326993b43eb---35764605915.pdf
    • https://durimawar.com/contents/files/9037125713.pdf
    • http://cuanhuaabshanquoc.vn/files/jamaropodukurujomawezomut.pdf
    • http://4seasonstours.in/userfiles/file/33363407758.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9cd7a6baf---13972739006.pdf
    • http://gespk.com/userfiles/file/gawenimibewelelewexe.pdf
    • http://sentezetutmerkezi.com/upload/ckfinder/files/5910029040.pdf
    • http://ver9ctrl.sonikgps.com/ckfinder/userfiles/files/bipobulurewonexejudexu.pdf
    • http://pomelieagency.com/userfiles/files/xuxipexozoz.pdf
    • http://shethof.ch/cgi-bin/dynamisch/file/karatomosavevofigevebida.pdf
    • http://fygl.net/uploads/file/122020538185.pdf
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/bemevil.pdf
    • https://abcoegypt.com/userfiles/files/bosiwubawo.pdf
    • http://chornakorn-packing.com/ckfinder/userfiles/files/38957082907.pdf
    • http://entrackintl.com/uploads/18712564443.pdf
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/wubugenipajujovamazo.pdf
    • http://enjoy.sk/editor_uploads/system/files/16166873847.pdf
    • http://actlogistic.vn/upload/editor/files/87896372732.pdf
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/sejajifakedimemisikowukem.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=earn+to+die+game+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_off0000dd83.bin
17114ec584267dba61913c7b65dc01c28b55a25abae23ed00a0458f6c7c2bf88		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD83 18344 bytes
font_01_sfnt_off00010d0f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0F 16792 bytes
font_02_sfnt_off00012526.bin
7fd9dbe458c66b194463405bb4261fb847ac793ecb24b000ced63949038ef07c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12526 10492 bytes

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