Malicious PDF — malware analysis report

Static analysis result for SHA-256 27968ddbf63a0051…

MALICIOUS

PDF

77.6 KB Created: 2021-09-09 03:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: cbc40f0c0bfee046b48c3a551cbb06a7 SHA-1: 94fa031eb6077e74aedee93f42587c1ed7a14199 SHA-256: 27968ddbf63a0051c65a694668a66e27f5d7479552df97e5104f9769400e6711
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://eva.am/files/dd09ba632037f836.pdf In PDF document text
    • http://md-servicios.com/userfiles/file/25243746083.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/nilusokuxufo.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/zimen.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/mafubawisotofulak.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210904223021.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/xaxarimewovapan.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/katul.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/dopewigebigi.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/28662407237.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/6431482222.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210903150600750787dg271g.pdfIn PDF document text
    • http://radiosalsa.fr/php/rs/filesupload/file/rubejul.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/belugoruv.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/56902571858.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/42713199552.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=gta+san+andreas+save+game+100+complete+with+girlfriendsPDF link annotation
    • 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_off0000c6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E4 11432 bytes
SHA-256: a00826a78e09bab4e8f96c696dead149666f699475d4b937f53c8ca105fad6fc
font_01_sfnt_off0000e195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE195 18320 bytes
SHA-256: 4b219c3eb2f9ed3db1c41db38f4d82283e6e0a5589b9a7afc9679679a7043ec8
font_02_sfnt_off000110ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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