Malicious PDF — malware analysis report

Static analysis result for SHA-256 7098c4f8b4396f00…

MALICIOUS

PDF

82.8 KB Created: 2021-09-18 05:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 72d0e41416cd82cbfa07578da23264c7 SHA-1: 1120d3b634c74e2896d0bb78fa4f6177db234697 SHA-256: 7098c4f8b4396f000e50289b5f73da8b10057fb89fd2ecddbe8d7580b6a8a1f0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF sample was flagged by ML and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. The embedded URLs, despite some being marked benign, contribute to the overall picture of a link farm designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://sushiosushi.com/uploads/files/60224820908.pdf In PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/pozefatif.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/pewadiletivino.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/wixijenerewasuxup.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/niwarorowit.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/32057897184.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/6130d3234d80b.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/xizezumarekunarego.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/78838866659.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/dolupusesepefa.pdfIn PDF document text
    • http://kdsonline.org/userfiles/file/kamodavonijide.pdfIn PDF document text
    • http://santabruna.cl/upload/file/26778161581.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210917232747_sn00z1.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/ridufesekipusufuz.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/sobuxof.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/24610740384.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/bekurukazonadoxixuz.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/8e06fc27a960609fbacc85eb79bece23/24900342348.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/zetojoxigul.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/72895570165.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+sync+cell+phone+to+computerPDF link annotation
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/92291800548.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_off0000df82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF82 10676 bytes
SHA-256: 2597c5d18b41c4a1e4b128fdb20298222964237beacffe5f1046c0c1c37350ae
font_01_sfnt_off0000f7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D7 17608 bytes
SHA-256: 8426ade15785e2d2fb0e29c45469cd5a7777d67dfa8640fb9de121ce27f99aed
font_02_sfnt_off000125ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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