Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0e756ed202877c7…

MALICIOUS

PDF

95.1 KB Created: 2021-09-11 19:52:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3b60c127a9dcdef0c29f374fa65da912 SHA-1: 50a2595e4a38089cfe6541ea5e211a0b718b5e3e SHA-256: c0e756ed202877c70301afa0225066f52598728a8dbec807d40d2bf19333b30c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF with a high ML classifier score and ClamAV detection, indicating malicious intent. It contains numerous embedded URLs, many of which point to suspicious domains and are likely used to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a link farm designed to obscure the true destination, further supporting a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://successalpha.team/upload/files/nazirixanaki.pdf In PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/99406728815.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/042025be6aa1dfe3be6ab79ff75358d2/xefodejewivefozidafopu.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/mezivol.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/96751592171.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/87032932293.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210907152923.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/mipimiv.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/7823107339.pdfIn PDF document text
    • http://altinay-law.com/images/file/17785074208.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/tapexoseruxapanixurin.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/16078348518.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/93354561252.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/54060884810.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/pesabelebolofifel.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/pujebuturesulowedagobe.pdfIn PDF document text
    • http://vongtaygiay.net/media/ftp/file/91313530976.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/77745647910.pdfIn PDF document text
    • http://khocabien.com/uploads/files/79557504794.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/97295005075.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/89026160160.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/jevagixofipokamuzizub.pdfIn PDF document text
    • http://phanvienphianam.com/uploads/userfiles/file/mesiduwudatugajenag.pdfIn PDF document text
    • http://usmleworkout.com/files/file/fapomatiwuzugemaru.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16130287d448ca---dodifuzozison.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=harry+potter+and+the+philosopher%27s+stone+full+movie+eng+subPDF 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_off00010bb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB6 18456 bytes
SHA-256: 350cb88681c00674eff035458ced364b9e485151bed830757ca37e50ab96ec32
font_01_sfnt_off00013c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15448 11388 bytes
SHA-256: 344a256096bbeed823b0de5ec991880c48f636a5fd4040c44e462135eaa3a623

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