Malicious PDF — malware analysis report

Static analysis result for SHA-256 365b311a1861ba1b…

MALICIOUS

PDF

85.3 KB Created: 2021-09-18 00:42:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d99d77837b1e2a7960bddc9b401d9eea SHA-1: 920c493e9c9b51245467b13b854063373d4bb7fa SHA-256: 365b311a1861ba1b540d2e5f9553c4cef765485ebf72aabbce8b3275e502e381
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm PDF. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://archism.ru/uplcv?utm_term=dragon+loves+tacos+pdf PDF link annotation
    • http://getvisa.ru/images/File/jukitubatilakovid.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614406dc5c6b2---59082243974.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/zuganupuniwadejitev.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents/files/tebolatu.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/88799269807.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/modemimidika.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/12114530824.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/domututoromosexi.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/suzebawufopafaxowa.pdfIn PDF document text
    • https://sitarasign.ir/data/file/6275142989.pdfIn PDF document text
    • https://harom.ro/files/file/34602026531.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/tamenujivojixetukowe.pdfIn PDF document text
    • https://renewone.de/files/pojifonu.pdfIn PDF document text
    • http://inbond-cn.com/userfiles/file/24832561776.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/56112704357.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/joxilelar.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021091115473973499.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/66676314071.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/zititotabowadetiw.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/83191558357.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/65806225754.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/wovewamulavimotelu.pdfIn PDF document text
    • http://exteractif.fr/pictures/2/93172792805.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_off0000e4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A2 10768 bytes
SHA-256: db0012fa46fdea2f32a63c650e45c121bf80b5d019ae528d177608f07cffa325
font_01_sfnt_off0000fd61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD61 19292 bytes
SHA-256: e0a71ba93050b76eb9d225464ecd30b55849ad68faab2d1f25bc6664be5ed4ad
font_02_sfnt_off00012fe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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