Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae0fdf16628cdd6a…

MALICIOUS

PDF

91.0 KB Created: 2021-09-15 16:26:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a943e03d8f1994976fde7171fc9158ea SHA-1: dfdf530e5abe54237f9742ba15a241ae0082f83c SHA-256: ae0fdf16628cdd6ae562f95865e8f85516ec121a0ab9255b7bbeecc8da3e8f0d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm. One notable URL, 'https://infrive.ru/uplcv?utm_term=warhammer+total+war+2+trainer', suggests a lure related to game trainers, which is a common tactic for phishing or malware distribution. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the presence of many external links strongly indicates a malicious intent to redirect the user to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://infrive.ru/uplcv?utm_term=warhammer+total+war+2+trainer
    • https://www.sterlingsez.com/ckfinder/userfiles/files/55276656554.pdf
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/fadofitovubutofugifadarej.pdf
    • http://1night2day.com/ckupload/files/7744623564.pdf
    • http://thestarbusan.net/FileData/ckfinder/files/20210913_8600FFF73340A69E.pdf
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vazudigejadexelunop.pdf
    • https://nacionalequipamentos.com/ckeditor/uploads/files/silafurirebajexosexewogeb.pdf
    • http://autoklej.pl/app/webroot/media/files/59326277000.pdf
    • https://losaltos.com/wysiwygfiles/file/wopopizefemurebimoz.pdf
    • http://kechengchem.com/upload/files/tutobujawof.pdf
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/88180194368.pdf
    • https://cheeselicious.net/UserFiles/file/3708434149.pdf
    • https://autonoleggioassereto.com/file/35831683344.pdf
    • http://zehanbiopharma.com/upload/files/52826924783.pdf
    • http://parzenica-bialka.pl/userfiles/files/49637859693.pdf
    • https://ud-hobby.com/images/Upload/file/93378498189.pdf
    • http://faizleathergloves.com/userfiles/files/mawigunefisa.pdf
    • http://lrpharmaceutical.com/upload/files/86133908703.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140962c9ac8c---97758654414.pdf
    • https://chungangroup.com/uploads/files/202109041255362186.pdf
    • http://alnoorcity.com/userfiles/file/revekudatedemitoxofif.pdf
    • http://honderhotel.com/UploadFiles/FCKeditor/20210910152724.pdf
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/zatazegijepivele.pdf
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58906994689.pdf
    • https://rh4-h1tapi-turbo.com/contents/files/15136395264.pdf
    • http://sportservistocik.cz/UserFiles/File/jixawobife.pdf
    • 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_off0000fe43.bin
c5d6ccfcd06a33ac67c2cb352378cd45aade08a7dca9880e493afb477c884f22		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE43 18608 bytes
font_01_sfnt_off00012e90.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E90 16792 bytes
font_02_sfnt_off000146a7.bin
1b45060803bbc373c81f8ae54bd38bf949377eac7d36fa29e1051e122335d76c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x146A7 10404 bytes

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