Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c5b45681f663df…

MALICIOUS

PDF

77.2 KB Created: 2021-09-09 06:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 69e11db128bb4aee6d94f88586673f06 SHA-1: 8db33eba5fac6a197f3b4d7543cb04b5ef1c7eaf SHA-256: 85c5b45681f663df18816cb3dc8a54845b33d24460903dcf3e18c822ea1391b6
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 potentially malicious content. The document body is heavily obfuscated, but the presence of external URIs and the link farm heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://impactpluslearning.com/ckfinder/userfiles/files/97566908268.pdf
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78300330901.pdf
    • http://rydelko.eu/userfiles/file/movisusabixuzodefobine.pdf
    • https://thailonghoang.vn/upload/files/75673428007.pdf
    • http://ji-tien.com/userfiles/file/25062480570.pdf
    • http://frankifoto.com/uploads/pages/files/buvip.pdf
    • http://cuacuonductudong.com/upload/files/46061780752.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16139434eec511---sovodupatoranazegeladuv.pdf
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/5371575290.pdf
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/34673824269.pdf
    • http://meubelenindex.nl/images/uploads/muvuni.pdf
    • https://residenciasanamaro.es/userfiles/files/xuworejefurogiza.pdf
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/54351016486.pdf
    • https://bostoncake888.com/UserFiles/files/23200841287.pdf
    • https://kitapkaplama.com/upload/ckfinder/files/31896916112.pdf
    • http://paradisoseminatrici.it/userfiles/files/jutafakigavatenojisula.pdf
    • http://cpghollywood.com/userfiles/files/zivoketitupuwagitabaje.pdf
    • http://compsult.net/userfiles/file/tevonoponugasedu.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eee536c0b7---40724518054.pdf
    • http://a-pluset.com/userfiles/10105556144.pdf
    • http://gloteckr.com/upload/editor/file/31157887273.pdf
    • https://creteservices.com/FCKeditor/userimages/file/17370459148.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=the+average+rate+of+change+over+the+interval
    • 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_off0000c6e6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E6 16792 bytes
font_01_sfnt_off0000def8.bin
11d69d71c6a47a0b8d5c03f395a9be8769e90d0666cc5f7e6efd6d344765007c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF8 17804 bytes
font_02_sfnt_off00010d5f.bin
677fb74467b0efb926e1be7e23d2a8ff44b24e9e9f766542ea95d29cad516daf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5F 10476 bytes

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