Malicious PDF — malware analysis report

Static analysis result for SHA-256 0325e6cf7e5caad9…

MALICIOUS

PDF

71.5 KB Created: 2021-09-27 02:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 58b8e1fea42ff40d8349583942985b18 SHA-1: cc78b7b6298cf431da48dfb3d88989b62200565e SHA-256: 0325e6cf7e5caad960deffd840beee8fdeeb5867105516e2d421987d2a1426fe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ML classifiers and ClamAV. It contains numerous embedded URLs, with a heuristic specifically flagging it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to potentially harmful content or facilitate SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://tropo-design.com/ckfinder/userfiles/files/18064931024.pdf
    • http://e-baze.lv/images/site/file/43765487638.pdf
    • http://waycreon.net/bhaskar/yii/upload/files/pesixiwuxoseguzalosidin.pdf
    • http://grandioso.asia/editor_upload_image/file/nozitetemubunewesina.pdf
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/58866926943.pdf
    • http://sevennews.com.br/ckfinder/userfiles/files/86242570409.pdf
    • http://usa-ex.com/images/blog/file/70498406540.pdf
    • http://djpress.pl/Image/files/lidekibomafatowo.pdf
    • http://wernitznigg.at/files/79624020610.pdf
    • https://bokaichenyu.com/upload/files/xowagelijoxiwopumet.pdf
    • https://imagebeaute.fr/userfiles/file/sazifibexajopasixis.pdf
    • https://aprilboya.com/userfiles/file/fuvij.pdf
    • https://interference.ajoda.eu/userfiles/files/tavedomifa.pdf
    • https://arerp.kr/data/file///9975350981.pdf
    • https://soportedevida.mx/ckfinder/userfiles/files/10493037367.pdf
    • http://www.oiseaubleu-promo.fr/userfiles/file/43660920717.pdf
    • http://gpsputhuppally.com/userfiles/file/zonexitisikomakirojoloneg.pdf
    • http://globomax.eu/userfiles/file/mememolami.pdf
    • http://dotacjedlaoze.pl/userfiles/file/19575459583.pdf
    • http://goksirkrupskimlyn.pl/img/upload/files/59883948324.pdf
    • http://www.azurwelcomeservices.com/userfiles/file/93091750384.pdf
    • http://bdnchem.com/upload/files/pufonofarejifafetopafawos.pdf
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/zizumekiwumiled.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=youtube+music+mod+apk+2021
    • 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_off0000b046.bin
88cd71a712667d61a720e539cd149856e79947e4c5cba7f1d7918f96a21729d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB046 17692 bytes
font_01_sfnt_off0000dd81.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD81 16792 bytes
font_02_sfnt_off0000f598.bin
70a1b4243feb3da9fc0fe5fa8cdc8b804433c3faef4f262c0cb90d3b80e593a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF598 11032 bytes

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