Malicious PDF — malware analysis report

Static analysis result for SHA-256 03837975d9a8b9d7…

MALICIOUS

PDF

68.8 KB Created: 2021-09-25 13:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e53bfb963e528a6324b5794c6a3db0be SHA-1: b99eeee4c4ca97b8bee0d7626401f2e17772e7ba SHA-256: 03837975d9a8b9d7450496af53b228b7313912b688e849faa33ec0f9670cceca
126 Risk Score

Malware Insights

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

The file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous embedded URLs, many pointing to disposable hosting, suggests a link farm or phishing attempt. The 'utm_term=download+droid+for+pc' in one URL indicates a potential lure for software downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://sfeerweter.nl/userfiles/files/fukabiwotopejeruguj.pdf In PDF document text
    • http://turbotechnik24.de/userfiles/file/26495441061.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/wuwudosolekofarotedew.pdfIn PDF document text
    • http://sial.pl/galeria/file/80187902569.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/gedebujewesubafavora.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/26501033107.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/58959665137.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/62650186918.pdfIn PDF document text
    • http://gartenstadt-apotheke.com/userfiles/file/woxadizututozujeram.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614098f3bb46e---73293179474.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/17667167380.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/51532297088.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/sexuzuwinumiguxebusako.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/maluluvowonesenekadox.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/tegojumulidukagiv.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///vixanujewidepoxudiredoje.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/wogubunomo.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/sujuvukedugibodumowus.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/vozutokogosufisusuvodunak.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/ronetaxisumuxibadipezazef.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/bepazijulot.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/fupewamamaj.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16130376da970e---70361392057.pdfIn PDF document text
    • http://puebloexec.com/userfiles/file/93322283183.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=download+droid+for+pcPDF link annotation
    • 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_off0000afe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFE9 10304 bytes
SHA-256: 19f4d10918103ac6d1977aa23849f52af14f4d62b517c5a8527d87f3f9e8416d
font_01_sfnt_off0000c730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC730 15460 bytes
SHA-256: 92a7e5d77379daa7821692f87a9895f98bcab05d42ebd46b7b45c736183b2190
font_02_sfnt_off0000eded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1