Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1745af3d4ee97ef…

MALICIOUS

PDF

82.3 KB Created: 2021-09-23 04:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 54576f35399f976376d49685e3dcd84b SHA-1: 468551602c184003c726af5a10a6067a11bbeff3 SHA-256: b1745af3d4ee97efaa2ee5a35701b34d91d135c549c17b140ada01b4de2b603c
126 Risk Score

Malware Insights

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

The sample was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The PDF contains numerous links to external PDFs hosted on disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the presence of PDF-specific malicious indicators and the nature of the URLs point towards an attempt to redirect users to malicious content.

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 http://halongbaycruises.org/upload/files/runatorogovelipule.pdf In PDF document text
    • https://299-45.com/CKEdit/upload/files/riranus.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/79824281789.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/jijidimekotexukil.pdfIn PDF document text
    • https://beaszemin.com/files/2732433765.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329d6d60e0e---64813123156.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/50838608749.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/94574625641.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/39390510363.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/gopogibisiruguxodaz.pdfIn PDF document text
    • http://disonde.com/filespath/files/20210923051951.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/fuwaralarupitivubatat.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/rakovazuvunoxojozopa.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/5b548cfcd9cd8f8a0d30b236254f22ab/jibiledadekusi.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/60014064797.pdfIn PDF document text
    • http://ortosprendimai.lt/userfiles/file/durabusexipibomumekabisev.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/16513849649.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210908101340.pdfIn PDF document text
    • http://ilkconstruction.com/Images/Media/files/87188764085.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/2138591687.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/xavolopesusegibokureza.pdfIn PDF document text
    • http://handgun.ee/media/file/milagunadakidabe.pdfIn PDF document text
    • http://yilbasipromosyonu.com/userfiles/file/66708176923.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/42427358490.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/nijugetadojubajeleka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=apa+format+7th+edition+reference+listPDF 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_off0000db09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB09 10916 bytes
SHA-256: 3ae333646285b503a251f51e55617a27d34ffddf9852d1efdef59f910a42af3b
font_01_sfnt_off0000f436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF436 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C48 18544 bytes
SHA-256: f3342b242ffa3e7b41fce32ca5c6264a6e83c9a3ec9d27f2af7fdae9c0b6a2fd