Malicious PDF — malware analysis report

Static analysis result for SHA-256 b829967d144daa96…

MALICIOUS

PDF

70.1 KB Created: 2021-09-13 01:21:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b4bbc6773f558ccf9eeda8bac5ea3024 SHA-1: 22ca9ba45487e8159fd4e693ac4aa3ced6741389 SHA-256: b829967d144daa9694c94f5b6f3ec228185456320f9b64ef0539faebd87f3776
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URIs and is described as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The PDF's structure and embedded content suggest it is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://allytemp.ru/uplcv?utm_term=leadership+words+that+start+with+m PDF link annotation
    • http://tivatijapan.com/uploads/userfiles/file/39095016430.pdfIn PDF document text
    • http://iwayman.com/uploadfiles/file/210912215443173515b55mvw.pdfIn PDF document text
    • http://riviera.az/userfiles/file/befupatedenikalisujetabi.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/71369359362.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613d38645dfa3---39957057752.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/22900372196.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/pukezajavisuba.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/97504020357.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/logisop.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/gevifibubajule.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/10218759832.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/jisebusuzimaxexegevu.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/efd03ae5739eaca28158545e5f5df004.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/susosodaluvupiburu.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/jefuligakotapew.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/norinadoxuxa.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/38605393742.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/662de14bad4edad56aea433286610710/setamowojufos.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/surezasuruka.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/dazilu.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/82207296002.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/zuxekowi.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/83605042728.pdfIn PDF document text
    • http://strap.sk/uploads/file/91339415667.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b21f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB21F 10548 bytes
SHA-256: 7d625c8d3deef609c08524a958bb48383016745b01cdcac906d7e92517caabcd
font_01_sfnt_off0000ca33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA33 15836 bytes
SHA-256: 3d93bda3e31741f5db4fd2753f6bbf3d2170776cf5a16dd7d38c74273fa705cd
font_02_sfnt_off0000f2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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