Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0a47924bb62d170…

MALICIOUS

PDF

79.0 KB Created: 2021-09-16 12:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0c867fa0b01b897ab67a4f5ed03626cf SHA-1: 52c1a79081c63dbe661b84b2646bb0b70b941cf3 SHA-256: f0a47924bb62d17017279467b91fbb103295b55f1e17ef25b351db217880b402
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. It contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for phishing or distributing further malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a deliberate attempt to obscure malicious links within a large number of seemingly unrelated URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0c011ae60---ragunola.pdf In PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/161314942acc84---pujadasi.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/loporesoju.pdfIn PDF document text
    • http://gro-felix.si/uploads/61653766934.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/64999534726.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210902_190119.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/luwarozel.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/48066873265.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/92892476632.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/kasedikixitagi.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210906202152.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/11918276256.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/96423891805.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139363469436---34151099667.pdfIn PDF document text
    • http://apicn.net/upload/files/panewa.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/joxuverasugomaj.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109110219346155.pdfIn PDF document text
    • https://mackbeks.com/files/file/muwutipab.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210913204649115.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/wuzomiriloxujokipabubiviw.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/nopatinutuxakeginivusegu.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/95329469624.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=faire+une+capture+d+ecran+sur+androidPDF link annotation
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/buziwirilulapokoro.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_off0000cce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FD 10536 bytes
SHA-256: 991d9a80779cd1d8bd5d09697918ec61305296584fbbbaa2a8c07299adcea6e2
font_02_sfnt_off0000fd19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD19 18816 bytes
SHA-256: 27a174184034a13a271a65ccec4d77df0a5b861da5789b0c352fae53d18642f8