Malicious PDF — malware analysis report

Static analysis result for SHA-256 e16744704a76a1af…

MALICIOUS

PDF

72.1 KB Created: 2021-09-11 17:12:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 022de0fbef403569fe89485b1379290c SHA-1: 9ec43ed227912f3519eadc24624927160eaef735 SHA-256: e16744704a76a1afb450a64a2574f5e59852487dbe259524b7581bc455fd238a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high number of unknown-reputation URLs strongly suggest a phishing or malware distribution scheme. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=kindle+fire+hd+10+user+manual+pdf PDF link annotation
    • http://ruihuitax.com/files/file/99850260399.pdfIn PDF document text
    • https://dafelia.com/files/30024021605.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/vonujuzebatutexazeras.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/1964344763613630c410d43.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/juvigi.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/buzumuwuvolatesomurotoxon.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/59505089006.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/63753172339.pdfIn PDF document text
    • http://nktrading.qa/file/files/xuvuvosofubewal.pdfIn PDF document text
    • https://camelcarpet.org/d/files/wedafe.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/93014024511.pdfIn PDF document text
    • https://superpart.com/files/jupaxamo.pdfIn PDF document text
    • https://yapluka-services.fr/userfiles/file/rutezenabasiniximuw.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/gejevepebamizigenesuj.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161344e59a8611---gasasabasit.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/88365312638.pdfIn PDF document text
    • http://thongthien.vn/upload/files/kibasopijukerapopagenuvud.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/lilukaloposemizebufidape.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/b8381fa4d7a96abaf9a66379c542ac43/pevugepujamuz.pdfIn PDF document text
    • https://safarekhoob.ir/basefile/safarekhoobir/files/68757084204.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/56511854226.pdfIn PDF document text
    • http://keramann.ru/uploads/files/linidafinexutisibu.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/kawinegaziwobujonawu.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_off0000b71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB71B 10812 bytes
SHA-256: d3aaf92e0125bf3680ff76774b0de9785b63bcb96dc8d4127072b8fdf7140d80
font_01_sfnt_off0000cfc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC6 16788 bytes
SHA-256: a376d98609758d23326758d26293dd49825c76ab3b7961b88881b18ab96e799b
font_02_sfnt_off0000fa84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1