Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4cf13338603cfb8…

MALICIOUS

PDF

69.2 KB Created: 2021-09-27 09:38:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a007812ef1201278eccc46db5d1c853a SHA-1: 598c4b115115bc19ab714502a92d7ea90a7c8fb8 SHA-256: e4cf13338603cfb85917a227a7e28e07bfbefdad94394dd62be452af8ff6de49
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. Heuristics indicate it functions as a link farm with numerous disposable URLs, suggesting an attempt to redirect users to malicious sites. While no scripts were directly extracted, the nature of the PDF and its embedded links strongly suggests it's designed to facilitate phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://pomodorolennep.de/gfx/userfiles/files/24801942870.pdf In PDF document text
    • http://elma1.ru/!upload/files/14446025704.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/lovepizaluwedefufusezup.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/xijonusavu.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/pezegifedowafogoma.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/66052515882.pdfIn PDF document text
    • https://rais.bg/uploads/file/xisajumixegojibax.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/torozazaw.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210916234326.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/wagon.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/zurudewexikesizevojov.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/539575167.pdfIn PDF document text
    • http://thegioioto.store/upload/files/risubejude.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/84627119646.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/78060307740.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/650dd75231161d32b70eb2c74e8e1c44/87772890900.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/mageb.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/39965239260.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/68478489048.pdfIn PDF document text
    • http://fk-fudosan.1nino3.com/app/webroot/img/userfiles/files/81809294201.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/topekijokalo.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16140bb86044c9---45328101317.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=pdf+python+crash+coursePDF 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_off0000ad5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD5A 16188 bytes
SHA-256: 13336500c13fbb600769f7d287c76f7526a264f4baeb1075cd51cc0427946dd3
font_01_sfnt_off0000d6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBD 10792 bytes
SHA-256: 110930378fdb336366cc1d5d2a3887f4d502e74fc1406894f995984a588f5008

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