Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba49fb64a7d65bab…

MALICIOUS

PDF

69.8 KB Created: 2021-09-09 19:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a2f706f7b4fba62b80be5884708ca01e SHA-1: f78da4c61bc41210a8275f87014ff177b1b66222 SHA-256: ba49fb64a7d65bab18e945df1b56b0c1d9b78d891f4b12f40f0f46d4cb803cde
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to other PDF files, suggesting a link farm designed to obscure the true malicious intent. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly indicate malicious content, likely a phishing or trojan payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://csodamalom.hu/files/files/sagibugabupolawusidu.pdf In PDF document text
    • http://xaydunglenguyen.vn/upload/files/0dd4d4.pdfIn PDF document text
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/77566334804.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/32482611411.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/60829784796.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/megarumu.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/tilinusakit.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/18382351581.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202109071818079491.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/12444917012.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/mipalux.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/zipiliwukomawasar.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/59460322169.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/sumadejiwoduluweta.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/lofosubusur.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/xulowipejutezopakowafosal.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/mijitekozoz.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/sorezatorinulonor.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202109/file/1631113372.pdfIn PDF document text
    • http://scantech3d.com/files/valufilavutejewigaze.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/21622372919.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/zegutadege.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=manage+notifications+androidPDF 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_off0000b1bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1BB 15488 bytes
SHA-256: 2988b8279f0900ebed63cd1e44b56e97c27bc0568ea21cdab5cfecb5595e32cc
font_01_sfnt_off0000d90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF126 10596 bytes
SHA-256: 26b11c386118c3105f7f34d31bc266325d1c52d958dec164c016a878ed1e1d13

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