Malicious PDF — malware analysis report

Static analysis result for SHA-256 3851ed4c81a6462b…

MALICIOUS

PDF

79.6 KB Created: 2021-09-17 21:32:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 77105f0d39bb858f994c79c93b9a9a47 SHA-1: f1088e863dea8c142c41916fee3004dda418e0df SHA-256: 3851ed4c81a6462b69d55b986f80c4daba78eec5c08963ebbb1879015a0a2a35
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external URIs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=good+witch+season+7+watch+online+free PDF link annotation
    • http://azizolace.cz/images/file/sejixelepogusaferipojilem.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210910005204_pof5ee.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109110149094848.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/24693296572.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf5006bcac---xanemivoxa.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/nitesexotemamuxafirepaz.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/33623187886.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/73383946705.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/52809372369.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/98016594906.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021091321162660.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/59458093688.pdfIn PDF document text
    • http://brushes.tfe-design.dk/userfiles/file/xugemikowijipuda.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/jugivaka.pdfIn PDF document text
    • http://2safe4u.cz/UserFiles/File/78773692821.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/21394426787.pdfIn PDF document text
    • https://zhansq.cn/upload/file/69179860600.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/toviwofubo.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/d842b4c953cc7e180a17cb14238009f0/pexegaba.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/92203564273.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/98500536471.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/lerobavedopiju.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/20039509907.pdfIn PDF document text
    • https://highrise.pl/file/tilofusuxisadojovafomumon.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_off0000cfe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE7 10748 bytes
SHA-256: a51f763fa290ac346d71b8072762d79e8e499db7cf70f8a9a3cd03ea7de3e7f7
font_01_sfnt_off0000e8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C4 18452 bytes
SHA-256: 1b381be73953bbd4c320826759d414b96838dd348a5a515d903cf50ee1df138e

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