Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f4ed3c92275f144…

MALICIOUS

PDF

83.1 KB Created: 2021-09-18 06:21:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eebc3609f46ae86f318b439a4f4f66ce SHA-1: 33b4786094a163b1d9f45b67c912a4976b88a372 SHA-256: 8f4ed3c92275f144c59fd24a50f40ebdebea66391ad993932b42dc7ca1357237
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, with a high heuristic score indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613697c44a077---pefetunef.pdf
    • http://www.cafeinca.com/img/public/contenido/file/sokivudimuvanujupa.pdf
    • https://anitt.in/ckfinder/userfiles/files/bejuxotewosefefawu.pdf
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/saraderureset.pdf
    • https://aakritidigitals.com/userfiles/files/bugaxirejafukurebodob.pdf
    • http://votejoedestefano.com/editorData/file/12493334140.pdf
    • http://sun-green.be/ckfinder/userfiles/files/58632829604.pdf
    • http://jysfh.com/upload_fck/file/2021-9-10/20210910211251483531.pdf
    • https://siroyensao.com/upload/files/42986837615.pdf
    • http://www.ambatownship.com/ckfinder/userfiles/files/damofoxa.pdf
    • http://geombiagioschettino.eu/userfiles/files/95063576771.pdf
    • http://yeongwonenc.com/userfiles/file/46351748009.pdf
    • http://highspiritsmusic.com/ckfinder/userfiles/files/surutiwejowewagagalulo.pdf
    • https://minlinart.com/archive/upload/files/1323193291.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/1963d63cc95f0dadb619f17a987708e5/86461417222.pdf
    • http://zit-tech.com/userfiles/files/xuzikajaduwukupig.pdf
    • http://oecschool.com/userfiles/file/tosalanopoxatetasot.pdf
    • http://gesundheit-im-blog.de/userfiles/file/fujibabowape.pdf
    • https://torbay.ru/images/uploads/file/wujijotinaxof.pdf
    • http://inruho.ru/ckfinder/userfiles/files/zopalepemex.pdf
    • https://marbletreasures.com/uploads/image/files/78669398118.pdf
    • http://christ-china.com/filespath/files/20210909102226.pdf
    • http://quangphong.vn/uploads/image/files/xasunaraxexibuvafugur.pdf
    • http://barrybusiness-crm.com/ressource/devis-photo/files/53507610444.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=the+enduring+vision+a+history+of+the+american+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd28.bin
dee9b43631cff7c8288de35489faa69e79f8f3280446e1395eff0a7d624dc809		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD28 18080 bytes
font_01_sfnt_off00010c09.bin
d4da161bc6323eb56fee4642de8b551eaf4480030678cca5c830b3cee9ca90ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C09 11264 bytes
font_02_sfnt_off00012624.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12624 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.