Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce61ada46b5f053b…

MALICIOUS

PDF

75.8 KB Created: 2021-09-13 10:36:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f9f7c6bf6a375c11bd79e15f802403c8 SHA-1: ac5ed566717cd1cb613cce7194e757ffcdd08234 SHA-256: ce61ada46b5f053b883bb6019b310b37c9b33f0f559260dce38193dfce5829e5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains, suggesting a link farm or phishing lure. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a high number of distinct hosts with a single link each, reinforcing the link farm hypothesis.

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://menu2uplus.com/images/file/pekevowabelafok.pdf In PDF document text
    • http://daimarconstrucciones.com/images/admin/file/12327829547.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/86488762264.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/83542315759.pdfIn PDF document text
    • https://telliogluhukuk.com/userfiles/file/85536287365.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135d5556de8e---79236700575.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/jikatofuf.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/satukiti.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/62279973600.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/femupomutegorun.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/fakarivito.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/55213922184.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/29885791333.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/29423952039.pdfIn PDF document text
    • http://mobiliteit.nu/files/81807157680.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/setupexima.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/boxiwipipuxobujut.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/60603886017.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/kaduwo.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/81991436428.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/86520618524.pdfIn PDF document text
    • https://tdfstore.it/file/97568160111.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/96189086259.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=buddy+games+free+streamingPDF 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_off0000c442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC442 17156 bytes
SHA-256: d703b500675dde967c95072bfdb51f91a30fbab38d4465363f698b5060d40dc7
font_01_sfnt_off0000f0a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A5 10800 bytes
SHA-256: 9a29062ba99b15bcb51a316fca964892e70d5b54c6855b5bdeb5b853f3ace233
font_02_sfnt_off0001095e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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