Malicious PDF — malware analysis report

Static analysis result for SHA-256 107be35b16f1ce4e…

MALICIOUS

PDF

76.8 KB Created: 2021-09-08 21:17:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ba8d82fd4801a1683b6177b9ca8a7a37 SHA-1: 42f513bbf1a07684e45087b33a427c3ed1f378c1 SHA-256: 107be35b16f1ce4e2cdde579b367f78b960ceda4ec7f3d147fc5f3ef71029b23
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to potentially malicious or unknown domains, suggesting it's designed to lure users to external sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a link farm on disposable hosting, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 http://zrdb-drogbud.pl/Upload/file/riwojapirenofajumu.pdf In PDF document text
    • https://cissud.eu/uploads/ck_editor/files/gurufuzujibe.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/mariwukinidutojikas.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/77265416571.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/semuvuze.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/35592095745.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/93802815018.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/52942884228.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/togajiwabatonejo.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/5939279985.pdfIn PDF document text
    • http://willowslakerhea.org/userimages/sajamebojulomovum.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613376d6bc48f---segolasimodisomipaboda.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/fuvutukesarudabuk.pdfIn PDF document text
    • http://newworldss.com/uploads/file/58084962671.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/fufezetolanibop.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///guxifunod.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/newifelidoboradofu.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/rojid.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/ruwusog.pdfIn PDF document text
    • http://sinners-party.de/media/file/lavif.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/562096272.pdfIn PDF document text
    • http://bwc.lt/i/19201616871.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/6744338709.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/17849016545.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=simplex+half+duplex+full+duplex+communication+pdfPDF link annotation
    • 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_off0000cd5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE570 17668 bytes
SHA-256: d38916b2082b240458833efcd468df9c148a84be9ca2d5e3a740b61f319c8cef
font_02_sfnt_off000112f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F3 10896 bytes
SHA-256: b5621f38dc6c0f012d8288a029212beff09b1edbb53f73e978a9dfe1bbef1726