Malicious PDF — malware analysis report

Static analysis result for SHA-256 79482ef13079e641…

MALICIOUS

PDF

72.4 KB Created: 2021-09-27 21:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9a352b697d6fde5f7a251afd02e15e94 SHA-1: b5e47789be4270e9f6d655f25073d8ed068632b6 SHA-256: 79482ef13079e641e4e6a260319260f6410e681b4dea3918c94c338c3187e7bc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on distinct domains. The primary purpose appears to be directing users to a network of sites, potentially for SEO abuse or to serve additional malicious payloads.

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://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/99322160693.pdf In PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/2185288329.pdfIn PDF document text
    • https://sona3elkhair.com/userfiles/file/vokorixizirira.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/79898454677.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/giwoginezamuz.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/nisegajaxegefujugulew.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/jizerovipomogijenidizasiv.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/32361247239.pdfIn PDF document text
    • https://tuinvandecruys.be/file/mafumulogarogesewavita.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/gijeturadaxuw.pdfIn PDF document text
    • https://pu.vienhung.com/webroot/img/files/30289674570.pdfIn PDF document text
    • http://vucert.vn/uploads/files/nojofi.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210927_65CE185FE39060AA.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/38969253517.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/68835018698.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614af42ec0f4e---22891774354.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/kawiwigigizexedelagu.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/46816648258.pdfIn PDF document text
    • https://akvanova.ru/sites/default/files/kogigak.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/zetinix.pdfIn PDF document text
    • https://artgreen.vn/attachment/files/59981371567.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/baboseteju.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/belofeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=obd+fusion+androidPDF link annotation
    • 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_off0000b4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFE 18236 bytes
SHA-256: 3f3fa05ce53201a7c41e3c4b7863d1def5d52d89e2f82babb225a04c820f1f81
font_02_sfnt_off0000fcae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAE 10336 bytes
SHA-256: 55787e2fd656cb0df2159e9b1ea48e68f25d4e7719c63662811824e895b490c2

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