Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8326ba823ad94e4…

MALICIOUS

PDF

70.0 KB Created: 2021-09-27 05:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: e72c26eca79590c935e54e2f857c88a5 SHA-1: 0f6ccade89b2190b02db8031522916502ef92bb3 SHA-256: e8326ba823ad94e415e7bf509fc2166c9edf1eba8d78cd40e29db9683ebd541c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are likely part of a link farm or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are typical of phishing lures designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=little+carly+in+real+life PDF link annotation
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335ce04f658---38724795873.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/boxuruperopilorebarolizux.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/mudumolitejosawonaxag.pdfIn PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/burikopusosalikute.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/26854314491.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/43126804491.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/85374478700.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/34175148331.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/64008138833.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/161479c23ef298---83054636723.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/mutabetixeduxasojakidexim.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/dutugejefowapagakumobafe.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/jifetu.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/sewilasisusupesufu.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/fakulisire.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/64630497083.pdfIn PDF document text
    • http://orzo.cz/uploaded/files/vifusefelelikebigik.pdfIn PDF document text
    • http://rapet.hu/files/fozipisazowis.pdfIn PDF document text
    • http://sungder.com/upload/bugiwerisu.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/9351726152.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/35799719106.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/kuvemijuzoleba.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/88164189574.pdfIn PDF document text
    • http://mzch.pl/userfiles/file/90939666007.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_off0000b169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB169 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC980 10112 bytes
SHA-256: 34443472b43b0d625d2c3a75ac9739443d3809c48cf8a5652ed12c5965034a65
font_02_sfnt_off0000e029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE029 16696 bytes
SHA-256: 55362a5053d30c019661782b5f250cab7a3ebaa7c6b7edfb1c7ac0fccbbec177

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