Malicious PDF — malware analysis report

Static analysis result for SHA-256 72ef6ad7d56ef343…

MALICIOUS

PDF

70.7 KB Created: 2021-10-02 18:07:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e9a5bdba6f14a70f549c6188898b1b83 SHA-1: cc0db91617d04e57dcb9d88253dfc5f82808e752 SHA-256: 72ef6ad7d56ef343e595208a9779207555bb623c7bdcd00abecacdb8ba2cc90e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous external URLs, one of which is associated with tuning a violin, a common lure. The presence of embedded URLs and the nature of the PDF structure suggest an attempt to redirect users to potentially harmful sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=how+to+tune+the+e+string+on+a+violin PDF link annotation
    • http://maximaviajes.com/FCKfiles/file/23025909368.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/21967379070.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/zidiworezofevedaxarememu.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/vevosorofonexewomasun.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/081b9193852f08ab73ff633e338d59c4/xodawadilaledom.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/zagaki.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/69915000445.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/46009754892.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/39800619193.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/nakorewezujakogatis.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/zitosaju.pdfIn PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/narinerowog.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/46601077457.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/degebatoge.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/62992506771.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/sulubopoliperesolapi.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/4481359065.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/taxebejodatibizipibedavav.pdfIn PDF document text
    • https://lesura.net/userfiles/file/gukobufebi.pdfIn PDF document text
    • http://biosite.ru/images/news/file/11025798111.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/foduwelakepixilikafa.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///rufatojixilusuj.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/bumolobozukivob.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/sineroruvopagegixu.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_off0000b258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB258 16380 bytes
SHA-256: 67c3b3a34eed3339479cbbbb54647d584fcf4a17b24c4889036fb5bcd5883d48
font_01_sfnt_off0000dc4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4F 10628 bytes
SHA-256: 7064c1b47c593987443228c0bd42ec5d876fb3da848f70715d2ea28f7da7fa47
font_02_sfnt_off0000f49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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