Malicious PDF — malware analysis report

Static analysis result for SHA-256 83e362b101b0af62…

MALICIOUS

PDF

73.4 KB Created: 2021-09-25 08:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4666c5ed5528112a65483ae28cdc16bc SHA-1: 05cd68201dfbeedd9215f94065757e9405c3df78 SHA-256: 83e362b101b0af62b20d436be45d14c61d719e4f77686e9659f61943ee53b886
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, a common tactic for distributing malicious content or conducting phishing campaigns. The presence of external URIs and the overall structure suggest an attempt to redirect the user to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://cructi.ru/uplcv?utm_term=cancer+journals+audre+lorde+pdf PDF link annotation
    • http://fence-alarm.com/userfiles/files/fepadi.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/39998656546.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/96312175976.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/86391408158.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/sedomuwob.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/27713859405.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/warabedosodiso.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/f90b75a73cb20082a01d413e8888c8e3/59115197580.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/48376465558.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/bewibi.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/80958411674.pdfIn PDF document text
    • http://cobmedia.hu/include/83571118675.pdfIn PDF document text
    • http://arrhythmiaclinic.com/userfiles/file/20210920003212.pdfIn PDF document text
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/xegubifelakol.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/sumiwarez.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/zamewofejufuvamawo.pdfIn PDF document text
    • https://songhongresort.com/img/files/12025870885.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/43329332068.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614795e5e5020---2507280562.pdfIn PDF document text
    • http://2rent.gr/userfiles/file/nibebuberinoxolana.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/tupefilufasidifamekixutef.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/zuzidabomiguseguru.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/jozigodakejosumatirilew.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_off0000ba9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B3 10684 bytes
SHA-256: f9d4437ded2acd0b0c1939959c9d9bb62fc6a1b48824aa9084ac652e3a74b32d
font_02_sfnt_off0000eb55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB55 17512 bytes
SHA-256: 1e2c789a9c0476181c3dc91162fca91e90d6c6373adc6b74c143c5f7a56bbd5a

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