Malicious PDF — malware analysis report

Static analysis result for SHA-256 5268fb11d84e8d70…

MALICIOUS

PDF

70.9 KB Created: 2021-09-17 13:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 557c02815a1dc21e2a871640e28ff6e0 SHA-1: 4b40b099abd1350d96054ce1da4e8bbdca7f0087 SHA-256: 5268fb11d84e8d7015f2e1250122aad1c79dbb7d3b047428b36cdf29725446ff
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF exhibits multiple indicators of malicious activity, including malformed streams and a high ML classifier score. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to distribute phishing content or malware. The ClamAV detection as Pdf.Phishing.Trojan further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://laborke.ru/uplcv?utm_term=rise+of+civilization+android PDF link annotation
    • http://mylivediamondinventory.com/uploads/files/finuxupidugo.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/pugarolerumulevesosa.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/rijogokubibuninoj.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/30202115450.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613419936a55e---jesudazazozuvoxubenopuloz.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/lunojirabidifugusitam.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/54645299793.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/tifugu.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/zesor.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/6584777265.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/banubexexinuvol.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/43874126433.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/puvaxavez.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/nesafevofurolesiwin.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/nujelok.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/vibofepadunuw.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/xuvemofowuberuwemegid.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/dutorutulor.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/68866045204.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/zufimagifivazaxo.pdfIn PDF document text
    • http://mrcookie.tw/upload/editor/file/15232333881.pdfIn PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/zizosabanokajopumado.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_off0000b4a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A0 15884 bytes
SHA-256: 4b540adb5bb6bea149181e5ba3901c8f751efadd8abf4d5bbffbbc68f48777e1
font_01_sfnt_off0000dd56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD56 10640 bytes
SHA-256: 7fd782114cd48703192fe188d97cd0a81beb293f421d05a5ebdbe0c1aa62e858
font_02_sfnt_off0000f5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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