Malicious PDF — malware analysis report

Static analysis result for SHA-256 e89824efdfa98eb2…

MALICIOUS

PDF

81.9 KB Created: 2021-09-20 01:13:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 709cf8857a42379e10b283113a370048 SHA-1: c15787b162795316d603cb5bc4c19faa9fd30631 SHA-256: e89824efdfa98eb20eba7fb1576e563bb1f3ad75dc563e358b47d1abb4f4479f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to facilitate phishing or download further payloads. The large number of external URIs, many pointing to disposable domains, further supports a malicious intent, possibly for a phishing campaign or to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://geoman.cz/data/file/bakuzesexuze.pdf In PDF document text
    • http://kfoodntea.com/dataroom/file/datewonininusex.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/6252770398.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/pesezasajabumenu.pdfIn PDF document text
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/wefizizudi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f88875867d---89430653186.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/joziviwufez.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/bekunufabiriroduwidowa.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/84186967839.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/18051590609.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/joliwarenok.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/bomovifatunuse.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/gijijosemugugekumivileg.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/70872437145.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/limeburorawu.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-20/20210920053329713053.pdfIn PDF document text
    • http://cnex.cc/images/blog/file/dijup.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/127f37f4a04c1b6eec8c528825c7ab4f/jukamite.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/31886323157.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/tozevu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=imo+call+recording+appsPDF 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_off0000dc7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7B 17880 bytes
SHA-256: 3d26d2b64cacb2ec465bc31c46fa712a0dade1e0e127d31d6308d1d0878cecfe
font_01_sfnt_off00010a2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12245 10712 bytes
SHA-256: 0f18dec1150e51c4b57f978bac11f9d471c887caf8f863e2f6ceae1e75cb4052