Malicious PDF — malware analysis report

Static analysis result for SHA-256 36de9a719a19338a…

MALICIOUS

PDF

85.5 KB Created: 2021-09-22 14:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6552ba281e566bddd6b0acb5451ce2b5 SHA-1: 338405d61b26ae4fbb79123c5e9cfc3e43dd6547 SHA-256: 36de9a719a19338a5bf5934af984345c471489cff6d933384f140ef7d8b22aa4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://kalmi.ru/upfiles/files/puxigekumeduja.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613af46ca7d53---xuvelazikaforobudu.pdf
    • http://dges.in/userfiles/file/subojufuvo.pdf
    • http://17njl.com/userfiles/files/2049410381.pdf
    • http://samocvet.org/foto/ck/files/bosibizuvujibizavokinoxa.pdf
    • http://quatangsongvan.com/hinhanh_fckeditor/file/56273734733.pdf
    • http://najlepsietorty.sk/uploads/fck/file/66659988143.pdf
    • http://ansonseatery.com/uploads/files/vuwulezinerakulivadosiva.pdf
    • http://videocycling.info/files/file/tagexoxosug.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/c2ae2333463b062f922c1d9da1fe4261/32588128328.pdf
    • http://hankyunget.net/userData/board/file/xujuporavidapot.pdf
    • http://zussobrance.sk/grafika/dokumenty/88565259354.pdf
    • https://pagodatalk.com/_UploadFile/Images/file/67076152049.pdf
    • http://synhbio.com/upload/files/wowofefowul.pdf
    • http://bollnas.boj.se/uploads/userfiles/files/46280773319.pdf
    • https://cs-nippon-cp.com/mailmagazine/upload/files/32908994662.pdf
    • https://wheelmartthailand.com/image/upload/File/22128241508.pdf
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/7694874474.pdf
    • https://khanikango.in/file/pujurefapomog.pdf
    • https://okazionche.com/files/86188941175.pdf
    • http://studiotecnicomancini.eu/userfiles/files/mimob.pdf
    • http://usaoxin.com/userfiles/2021-9/file/genanolalufosonenuxoju.pdf
    • http://thecuriosityshot.com/63567556803.pdf
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/kogukajizimamaxagubifen.pdf
    • https://transmilenio.net/datamont/userfiles/file/3628253833.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=telecharger+application+play+store+android+gratuit
    • 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_off0000e4dc.bin
3aeda9da2d46cc02718d7f1ff7c07291945673a849773ae84308c729df1baa1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DC 10968 bytes
font_01_sfnt_off0000fe1c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1C 16792 bytes
font_02_sfnt_off0001162e.bin
1842dc52870fc59dd4a87c6219f864bb4c122328e5b79c6754e3f2d3ea487ae5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1162E 18808 bytes

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