Malicious PDF — malware analysis report

Static analysis result for SHA-256 70cee5013f76c5aa…

MALICIOUS

PDF

81.8 KB Created: 2021-09-13 23:45:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9804a9f6820b483e9ef05c104f01021a SHA-1: 70045a19bf4a4c09bd2a6d5dc337951b15c50f66 SHA-256: 70cee5013f76c5aad62a839a82cd7b08626fd315ebcb5a4536db6a40b387b86c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, embedding a large number of URLs, many of which point to unknown or potentially malicious domains. The presence of embedded URLs and the link farm nature suggest an attempt to direct users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://skvely-kup.cz/files/file/rixuzotodugutepumov.pdf In PDF document text
    • https://alzubidi.com/userfiles/files/23438110648.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/vawazasezokebo.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/fidaj.pdfIn PDF document text
    • http://na3.it/misc/file/15341870350.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/xatitazefogusodob.pdfIn PDF document text
    • http://ychnjl.net/userfiles/files/mekejibexesawovi.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/fizatakiravapekade.pdfIn PDF document text
    • http://orderkai.com/uploads/files/joxujabuzelovixupi.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/wukiwitef.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/movavagodutul.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/27464020997.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/70650685583.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/21958490169.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/93120040648.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/31206787457.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/fevuludafomodojowo.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/44123774393.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/87187748300.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/gijuwimubuliwo.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109020144316901.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/62134597679.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376141995bf---30200408170.pdfIn PDF document text
    • http://wacommerce.net/home/integrity/public_html/ckfinder/userfiles/files/rufumevaxebe.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/55aedf969f9470c8e421a60ee34d62b4/zedijitutimujutobuzom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=tubemate+mp3+converter+apk+downloadPDF 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_off0000d90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90A 11036 bytes
SHA-256: 7d79f41923d7e0ff2208907b7974bb14058c9607cf1f807471456f69e799a849
font_01_sfnt_off0000f29d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010aaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAF 18056 bytes
SHA-256: e56a7ad963c834a52b2abf4f134ff80789b5b7e070e1dbeea094128612225d92

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