Malicious PDF — malware analysis report

Static analysis result for SHA-256 03193330065bed0b…

MALICIOUS

PDF

80.2 KB Created: 2021-09-23 04:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 865886c0193ace6a652624b5b9ec9b2a SHA-1: db3470f2ee719272d0c405e61f8beaf5c17b20fb SHA-256: 03193330065bed0bfe570250fdf5c9c74e377eb3abd2a37e68ca3326996c6922
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm, a common tactic for distributing malware or phishing content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the PDF's primary purpose is to redirect users to these potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145bac0c8965---tijiw.pdf In PDF document text
    • http://captainkillmite.com/uploads/files/202109210606562524.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/37371941492.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/40749747469.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/21136979694.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202109/file/1632013168.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/vuxunafisorurunekidisite.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/jojevotud.pdfIn PDF document text
    • https://vanha.kokkolansuunnistajat.fi/ckfinder/userfiles/files/sumogalaxaponisikufot.pdfIn PDF document text
    • https://sanidom.pl/img/file/12681997783.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/degalawotenojite.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/26513029305.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/72998834118.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/kalujejemadi.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/83642ac801b0993f25770116b2061862/1894289009.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/43226692012.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/mizumid.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/fovalisi.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zipatoremeruba.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210920_E15A0B7705E7C7E7.pdfIn PDF document text
    • https://thepainter.asia/upload/files/84035715706.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/21502261722.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=android+app+aufgaben+outlook+synchronisierenPDF 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_off0000d21f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD21F 11328 bytes
SHA-256: 62f329cc2caaf5a64c060e20b4c3961d38d88b31ddec0ebb8dd16d4822046dee
font_01_sfnt_off0000ec50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10462 18044 bytes
SHA-256: d17c811e831490eb50b99e567fc44a3966f68dad2dc2cecea42b6ac0233c7546

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