Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e603eff9dd1c766…

MALICIOUS

PDF

82.2 KB Created: 2021-09-19 23:38:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: faacb1b8807a45ed7233a9b146a1d1bf SHA-1: 1f2f79fdf350092cb3598bfc066e661a460f5b6f SHA-256: 8e603eff9dd1c766bec83040c41e97716623b5f0a514853438f6c57c84e93baf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to direct users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://janjoling.com/public/ckfinder/userfiles/files/nopunojaxezi.pdf In PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/godenozavokitodagejedid.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/visadudul.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/goliboribimajanuduk.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/82623514631.pdfIn PDF document text
    • http://recrute.fr/files/files/rozipunapogomesose.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/vatuwizumovaditedej.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/10858109877.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/70689151439.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/degokoxitaruwasomapupu.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/94974270006.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/gigirujunotozonikoladag.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d58cd3360---jilajuvenuzo.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/9645849388.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/buzukuj.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143bbc520ea9---34037611670.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/88205373822.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/52931726011.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/muvodisatuvidajovefise.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210911_88E8BC6CEC165EC6.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/64965951299.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/23689046988.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/baxunalalu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=tubemate+search+enginePDF 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_off0000dcc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D4 17824 bytes
SHA-256: 919b6673e659e657309f040845c6a8b09c44e66bb6d092352fccb2a4271d78f5
font_02_sfnt_off000122b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B9 10716 bytes
SHA-256: ed6f2d704a5ac92a470786f3e36505c33af1f600db42af340b308c90140df63b

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