Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0f95febbc77b284…

MALICIOUS

PDF

77.9 KB Created: 2021-09-24 17:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5485d0e41db8c3c7f30fd0d16bdef12e SHA-1: e77fbff66e14d50b5c80740fdfeab6488d88aca5 SHA-256: e0f95febbc77b2848420d890162788c7206f5a8ca268cae08d39cd65bb33d4d7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one pointing to a site that appears to be a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for multiple distinct domains, suggesting an attempt to evade detection and distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://coretry.ru/uplcv?utm_term=windows+8.1+product+key+2020+64+bit PDF link annotation
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/74959657764.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/70513218222.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/zuboxetebofogipo.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/gebedajogozubaleraxota.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/83476344792.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/73489852961.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/bokagazarizexemi.pdfIn PDF document text
    • http://baocaosuhoatoc.com/luutru/files/91896036769.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/gotisejojakupot.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/72313161518.pdfIn PDF document text
    • https://srsatta.com/ckfinder/userfiles/files/dirazowativ.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/69726693888.pdfIn PDF document text
    • https://duvarkagidierzincan.com/userfiles/file/70166098863.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/jeroxomumerebolujimaduluw.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/33809035082.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/fawelisixojufovobelat.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/8980501118.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/tizisagezoxop.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/bamegadekurejor.pdfIn PDF document text
    • http://azinsaghf.com/cache/fck_files/file/91423291399.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/fadafekuzuvaborisekibu.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/juremojubodetuzekutukina.pdfIn PDF document text
    • https://playworkspartnership.ca/sites/default/files/file/12122662693.pdfIn PDF document text
    • http://ud2-140.com/files/neziwupupiluvopam.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/51019476503.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_off0000c27d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC27D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA94 11636 bytes
SHA-256: 47aa723b6b15e857b814746decafa96578d89258316990987231270c5945b867
font_02_sfnt_off0000f660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF660 19972 bytes
SHA-256: ac4ed484b5ef28079d11264381f217cb602552d35f914f3e3ab3709a23787c50

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