Malicious PDF — malware analysis report

Static analysis result for SHA-256 f70b8a68e9da9e36…

MALICIOUS

PDF

69.2 KB Created: 2021-09-24 15:35:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3ceec029366457c0e51815cd82ff7a4e SHA-1: fb9e194f1d67329a0eb0c9583331c00ae53b1385 SHA-256: f70b8a68e9da9e366c672b3b65a05a8694ce8ff559ee65644fc818a336836949
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF sample was flagged by ML and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics identified it as a link farm on disposable hosting, with numerous embedded URLs pointing to potentially malicious sites. Although no executable scripts were extracted, the structure and numerous external links suggest the document is designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://gamma-electronics-eg.com/userfiles/files/fuzakokajetexusowerodux.pdf In PDF document text
    • http://evo-models.com/uploads/userfiles/files/zisufariwafisijozufam.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/38332467862.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/rikokixojowudafabakumipez.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/40356703301.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/57536624913.pdfIn PDF document text
    • http://sjhtractor.com/d/files/22282951628.pdfIn PDF document text
    • https://atavio.ru/files/file/vamepugupawo.pdfIn PDF document text
    • http://nemochem.cn/upload/files/farubi.pdfIn PDF document text
    • http://veszpremkosar.hu/_user/file/famobejufugiroderokalu.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/adcbfdb93782c38885dcc39743ab751d/91594611995.pdfIn PDF document text
    • http://ausafe.net/images/art/files/34937086935.pdfIn PDF document text
    • https://friendsofmultisport.com/ckfinder/userfiles/files/84184368047.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/53255655658.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/35032670000.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/kupipopojalilerifofojav.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/niminipodokepolaninupo.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/445c5d92513d13fffe0a1102db15aa46/fabigomabutadipozo.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210904_125614.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/83126786704.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/kusebolumuxitilufumif.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/jixalasudarolonogazifade.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=a+quiet+place+2+englishPDF 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_off0000b031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB031 10780 bytes
SHA-256: 45756ead74f7b2a722117773751c5a7ce42a712b8a5755e38cfe9f487585466e
font_01_sfnt_off0000c8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C6 15124 bytes
SHA-256: 58c25beac724f64e4f5936fd7260eb3067d8193d3814105e3d4c9b6b4c25c84b

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