Malicious PDF — malware analysis report

Static analysis result for SHA-256 3866a4d08e7a1058…

MALICIOUS

PDF

81.1 KB Created: 2021-09-09 17:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 11f728bf92efa8d0db12338b7897f082 SHA-1: 45a5bfb6fc2c566c4a01b31f0118b0c9b412fe7c SHA-256: 3866a4d08e7a10583d8f9517f394e8f2daba946730ca26b2239128aebe313bdb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and the link farm heuristic suggest the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://irlanc.ru/uplcv?utm_term=space+jam+2+online+stream PDF link annotation
    • http://geobigoni.it/userfiles/files/94050806518.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/54514230464.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/24071204216.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1630567767.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/14795793389.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090309222848.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/85231885563.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/nitekavuge.pdfIn PDF document text
    • http://myphamasia.net/upload/files/bizositalimidu.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/wavabebevugo.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/39199156245.pdfIn PDF document text
    • http://ruihuitax.com/files/file/39316095794.pdfIn PDF document text
    • http://sintniklaas.kinderopvangpimpeloentje.be/ckfinder/userfiles/files/42603413613.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/takewijulesuroto.pdfIn PDF document text
    • http://kolkataangikar.org/ckfinder/userfiles/files/1797422821.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/jugeximonilunidal.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/fifipufoxowed.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/td4akqh6lk7kq6j9gve7o78pm7/8037860920.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/kafegofasodagebuzekopuv.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/pemuxixaseniwok.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130688ca1554---63529546538.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/68742047209.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/65571747081.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_off0000d897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD897 10860 bytes
SHA-256: 9e6b2d81efb12d703c09a27b06c51a7dd46d7e62b6eedcc2ba792d95f333f866
font_01_sfnt_off0000f1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A1 17712 bytes
SHA-256: 589b0005caed152d2fa21e2e82900bbb329a18865c7b58db54efd6e47bfffc7d
font_02_sfnt_off00011f47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1