Malicious PDF — malware analysis report

Static analysis result for SHA-256 db1f327844aa3ea1…

MALICIOUS

PDF

76.9 KB Created: 2021-09-19 00:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 94843ed708ad8517dc9cd69a12fa6447 SHA-1: 501e6caa5262a2765f651f14c800bd6e4f79e0f8 SHA-256: db1f327844aa3ea1a3d04c88f0cd7d494bf70c09a1c41d026c646688b77c6f32
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many of which are on disposable hosting, suggesting a link farm or redirection scheme to facilitate phishing. The 'wkhtmltopdf' authoring application and the presence of embedded fonts are common in malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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.
  • 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://garglob.ru/uplcv?utm_term=black+navy+war+unblocked PDF link annotation
    • http://bioscipublisher.com/files/upfiles/file/redilujuxakaxumibemamuvi.pdfIn PDF document text
    • http://fgosvo.ru/files/files/71914059471.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/84266171062.pdfIn PDF document text
    • https://t-groupvnxkld.com/uploads/news_file/13329547540.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614296162f1ee---30826849800.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/7914780450.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/kozujijaritobu.pdfIn PDF document text
    • http://proxkimya.com/resimler/files/69233282326.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b735e5e818---27755628976.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/37573363879.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/gowiva.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/39260319462.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/wubasuxoxajogawupumoxo.pdfIn PDF document text
    • http://bfttacg.marketsearching.com/upload/files/12534504243.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/mujoxozugisijewonuku.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/fupagul.pdfIn PDF document text
    • http://pnalog.ru/images/file/fexipezeroliwezusasigilaf.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/jagelewajuzisidejim.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613742a8497e3---mutumoze.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/72099587066.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/12516606186.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/91330745264.pdfIn PDF document text
    • https://afmiletisim.afmiletisimajansi.info/resimler/files/66629054426.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/watuxitizufubulowazumo.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_off0000c50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC50A 18492 bytes
SHA-256: dbcd094369ebb272cd65174e50d66680f84e84862abfb60de77009533294ed98
font_01_sfnt_off0000f4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D02 10656 bytes
SHA-256: b5c1abb558138c7a9d371839d1834836dcca7ba5cb169556a13d0a90459daa18