Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ac9cf9f5704b6a2…

MALICIOUS

PDF

80.1 KB Created: 2021-09-21 18:06:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: da782aab390cca67a9c6224375afb44a SHA-1: 93651d29297c2a3b562eb829ffc0d25468a893fb SHA-256: 1ac9cf9f5704b6a2fc2e7f11067c174a714c1e1ceb414f4881e353751d7968d8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV and an ML classifier as malicious, with heuristics indicating it functions as a link farm. Numerous external URIs were extracted, suggesting a phishing or malware distribution attempt. The presence of embedded links and the 'link farm' heuristic strongly indicate an effort to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://ketchas.ru/uplcv?utm_term=soap2day+friends+reunion PDF link annotation
    • https://thisissati.com/userfiles/files/93339865000.pdfIn PDF document text
    • http://www.painters-restaurant.com/userfiles/file/moxuxawudupakomenimunef.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/9931677555.pdfIn PDF document text
    • http://cpils.com/userfiles/file/vatenepukenajudutizof.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613084b69df4b---xagarebatigigebumufaja.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/zivuk.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/kesiwiwufegotikobasedoguf.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/jevadazu.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/63054951942.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/10929804397.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/zodarerad.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/lixujupipew.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/gadexikokisibepiluteferex.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/33718475764.pdfIn PDF document text
    • https://linker.tw/files/57971855674.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/40256727574.pdfIn PDF document text
    • https://krajkarka.cz/userfiles/file/pilixesalasirelok.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/furifovobodanulifukade.pdfIn PDF document text
    • http://veitali.com/upload/files/6051241133.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/27705311453.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/95342844862.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/gofuru.pdfIn PDF document text
    • http://sangsangins.com/upload/upload/file/82931095366.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/75542635598.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_off0000d464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD464 17516 bytes
SHA-256: 11770d47c83d992894594fe335ba40fc79d08ee469ffbf90c35334351521a2f8
font_01_sfnt_off000101f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0E 10756 bytes
SHA-256: b8d2ff9221864392ac590b10ffa28a78088b84679b2d99e7c31c22f3f8dd3555

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