Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fd166d9021e3beb…

MALICIOUS

PDF

68.8 KB Created: 2021-09-29 05:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 7477f9173b5cfeccc844d136dfb83736 SHA-1: 80c9563e7b1cf6654f7915a8cead1390c2dc390b SHA-256: 2fd166d9021e3beb4fa285ff8550837cde6ada80a97f9b6dc46670b62e8bdf53
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains numerous embedded URLs pointing to external domains, many of which appear to be link farms on disposable hosting, suggesting a phishing or credential harvesting campaign. The PDF structure and embedded content indicate it's designed to redirect users to these malicious sites.

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 https://oniceh.ru/uplcv?utm_term=dark+money+jane+mayer+pdf PDF link annotation
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/nakod.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/wemegubidokokokadugufeb.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/27693226368.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/33969085797.pdfIn PDF document text
    • http://sensitiva.fi/UserFiles/File/pozemajetunavuvu.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/26934038799.pdfIn PDF document text
    • https://mbbs.hr/files/koxikozinideboviwiluju.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/zejefuvukame.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/30705658294.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/tetalikuvelejumuliniwitol.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/gevoxoxivoxipixatulino.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/46330932852.pdfIn PDF document text
    • http://plise.org/userfiles/file/jilapinaf.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/161438e6864b43---72911454752.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/44660173372.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109031447293950.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/83369383701.pdfIn PDF document text
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/81278817064.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/83388683171.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/jawujej.pdfIn PDF document text
    • https://nomortiga.com/contents/files/86923436294.pdfIn PDF document text
    • http://xn----8sbkebltdkywd.xn--p1ai/ckfinder/userfiles/files/kenimixaputijenatigedin.pdfIn PDF document text
    • http://eurosolar.cz/res/file/17089828329.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210923075424.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/55664085457.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_off0000aff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC809 15016 bytes
SHA-256: df0c0f1f714a0ccffad64e3ee8a195316f71365723f847bd468899410603b135
font_02_sfnt_off0000ed92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED92 10592 bytes
SHA-256: 4dfd94be46fbc8585f64b7bb274b4d604d994a89ac70cd8f62abd0ae778b675b