Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b0dd7b0caf4b26c…

MALICIOUS

PDF

80.5 KB Created: 2021-09-15 20:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f1d5e03db733c9d9141fedbfc0f319aa SHA-1: c06f580dfc5f6de5433d55724e70ae52f8ec20c0 SHA-256: 4b0dd7b0caf4b26c907c19f0e6ef7b1e8490e0b5f86389d277562e7fb1ad017e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, hosting a large number of links to distinct, potentially disposable domains. The embedded URL `https://allytemp.ru/uplcv?utm_term=watch+the+croods+new+age+for+free` further supports a lure-based attack pattern, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=watch+the+croods+new+age+for+free PDF link annotation
    • http://ambulatorioveterinariocamali.com/userfiles/files/49953056059.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/kixonipugezoveni.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/32598300713.pdfIn PDF document text
    • http://methese.com/upload/files/84703752638.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/51741891575.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/musivolixoladupa.pdfIn PDF document text
    • http://birdwatching.sk/media/file/44944941578.pdfIn PDF document text
    • http://z500.si/files/43986695707.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/79531154113.pdfIn PDF document text
    • http://neodermclinic.com/file_media/file_image/file/namogewikaw.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/dewojimegadirakumanis.pdfIn PDF document text
    • http://whatdwellswithin.com/file/85995422395.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/29406272283.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613060be8c883---70560247548.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/80066318225.pdfIn PDF document text
    • http://e5tbr.alruaa.com/ckeditor-ckfinder-integration/uploads/files/filal.pdfIn PDF document text
    • https://bem-sa.com/img/file/77697943106.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161352316a6ec1---majatetuzijuxu.pdfIn PDF document text
    • http://albertf.madteam.net/ckfinder/userfiles/files/jofepuxupinubugupud.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/bakasufowanepumig.pdfIn PDF document text
    • http://boissee.fr/userfiles/file/40065154371.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/87300302391.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/vunudosanixedate.pdfIn PDF document text
    • http://wawa757.com/uploads/files/bofazemerosa.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/tideseti.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_off0000d1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DB 19172 bytes
SHA-256: f88abb2a8a46cbefd64ab2e2b1a9bd9aeb5167aae4b04d432c398ed81554499a
font_01_sfnt_off000103df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF6 10696 bytes
SHA-256: 8bd32ebcfcec1f75966d0d0611ae92ae744aff80d83597de0f8c7e6d3f492820

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