Malicious PDF — malware analysis report

Static analysis result for SHA-256 266811d9fb729184…

MALICIOUS

PDF

89.8 KB Created: 2021-10-26 12:30:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 371d33c62f46b14d08f8a69fd21e4a96 SHA-1: bcb7cc47259f30cf7d05ae42f05ada02d8989e65 SHA-256: 266811d9fb7291840aad3de9670b32524ead2a0598525a368241498140a6a071
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics, including a high-confidence ML classifier and ClamAV detection. It contains numerous external URIs, many of which are hosted on disposable domains and utilize UTM parameters, suggesting a phishing or link-farming campaign. The PDF structure and the presence of embedded URLs indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ketchas.ru/uplcv?utm_term=thomas+sowell+no+solutions+only+trade+offs PDF link annotation
    • https://absoluteanytime.com/media_file/files/files/jisurepunakujexokudoxumex.pdfIn PDF document text
    • http://zenhowell.com/upload/file/31739720460.pdfIn PDF document text
    • http://balbu.hu/uploads/news/file/jesipebebogu.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/sawukokarigagiveromizimo.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/55487643354.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/banakopaxuxivo.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/fatuvadebutazul.pdfIn PDF document text
    • http://www.moyekolodin.com/files/dodirikuzidinajotujoruwil.pdfIn PDF document text
    • https://vozilasavozacem.rs/files/9561009908.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/39286059197.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/62182226562.pdfIn PDF document text
    • https://stancijanegrin.com/userfiles/file/11496498858.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/gisedo.pdfIn PDF document text
    • http://placc.info/up_image/jifupugo.pdfIn PDF document text
    • http://partiaweb.com/upload/files/fazafakagobiguze.pdfIn PDF document text
    • http://stapper.de/sites/default/files/userfilesfile/71629330076.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/tenigu.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/76563925171.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/wiluvogoxopofofusabuno.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/rimivanidofolul.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/wemumarusodelifuvufaf.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/51881521663.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_off0000f913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF913 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11125 18296 bytes
SHA-256: 2037464cb759f704d133281b93aec8553db46f657d86c9e33d09e443a9551175
font_02_sfnt_off00014026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14026 10880 bytes
SHA-256: fe373b32f1d4dbc3be26eef9503de382a82dbd10798b49fd0fda3f0d95f1d5b2

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