Malicious PDF — malware analysis report

Static analysis result for SHA-256 020fc64cb6d86730…

MALICIOUS

PDF

71.2 KB Created: 2021-10-03 17:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: db02dda2da71a8359ffc54cfbc323690 SHA-1: 5c29e85b1e68dedc35a3dfb97adc89b4fe068348 SHA-256: 020fc64cb6d86730049d64e8da1057a7db3424a098d63f0d0d6dea54c83e333f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, including a link farm on disposable hosting, suggesting it's used for phishing or distributing further malware. The presence of embedded JavaScript points to T1059.007, and the overall malicious nature suggests exploitation for client execution (T1203). The likely delivery vector is Spearphishing Attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=quiz+answers+beginning+with+h PDF link annotation
    • http://kmjmt.com/news/upload/file/210907072433863828gmo46y.pdfIn PDF document text
    • http://castel.lu/userfiles/files/33661631962.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/lurilusi.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/tofigi.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/dagifuvajov.pdfIn PDF document text
    • http://asv-solnice.cz/_files/file/pamejop.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109171154468874.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614bb73d7ffe5---fenap.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/46067608367.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147a2c582f9c---10012049537.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/68335417952.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/29368287115.pdfIn PDF document text
    • http://planbmedia.hu/files/xezutenudidatimalogakawa.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/wozemi.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/malisoxi.pdfIn PDF document text
    • http://vhz.cz/user-files/gukozazenokosox.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/33237357013.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/wunafutikavamivapibawobo.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/43938226116.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/96559007164.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/vonujixawenaji.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/72700359862.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/13977027911.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/4726013407.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/62552618846.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/pevom.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/79704918497.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_off0000b5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cde7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE7 15888 bytes
SHA-256: 2e77c914e1cde4ff3e079bd8fdc7e643f5661f37fe60429a961936eede5fbe47
font_02_sfnt_off0000f648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF648 10668 bytes
SHA-256: a8135609b951921018cdb5dafaf27a5908b9ba6a0abab31ce998d4c750190989