Malicious PDF — malware analysis report

Static analysis result for SHA-256 d877272b641f936f…

MALICIOUS

PDF

82.1 KB Created: 2021-09-11 15:35:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fc6c165d0ba1ccd06bef4e87de1c54b8 SHA-1: e8139f7cc528d749bf100565ee264fba12a11ef4 SHA-256: d877272b641f936f99f40f2587d884d6f2db139f4cee88e7db7e3a1ec50eb4c0
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 a large number of embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to malicious content. The authoring application 'wkhtmltopdf' and the presence of numerous links indicate a likely phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=it+started+in+the+elevator+book+2+pdf PDF link annotation
    • https://fleseriuassociates.ro/files/file/63602628054.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/zebedotorinuwox.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/15935930389.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/12010361913.pdfIn PDF document text
    • http://epicridesnepal.com/files/woxoli.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131264545d0a---30880018092.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/99337081595.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/gefesajowozozaxuv.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/12603217300.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/27829791306.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021090503450876.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/dopezi.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390540cba2f---jidomutosemomiranoxuro.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/6130719403.pdfIn PDF document text
    • http://vektorma.ru/uploads/assets/file/45884164403.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/30023354038.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210908_110603_125.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/famafalenemenusereduv.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/39900164168.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/81294118734.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/58273751051.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/wamivazisixawafero.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_off0000d878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD878 18780 bytes
SHA-256: 4a05c215a728f4cc552a156454050917ebd4825e715689039ecc55b12711edf5
font_01_sfnt_off0001099d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099D 10964 bytes
SHA-256: c807584dc0b9ff8cf03515e32872549760fe33f4712517947bede05cc3493885
font_02_sfnt_off000122c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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