Malicious PDF — malware analysis report

Static analysis result for SHA-256 f94a03caad9e2bf4…

MALICIOUS

PDF

71.3 KB Created: 2021-09-20 04:22:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 835e7f5387f7c0699ce03a3377c49d82 SHA-1: 450626f4fb78085a407059b5a99ab3fadabc39a9 SHA-256: f94a03caad9e2bf4bd28b160bac0159d51c95b765589855fc400b2e8be28b14d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or redirecting users to malicious sites. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards an attack pattern involving user redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/42176109133.pdf In PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/magigivazowiki.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/94024041506.pdfIn PDF document text
    • http://planetamama.ru/files/file/49046506009.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/61028583085.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/2083326276.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614229c68c0ac---zejefederomuzuwotimuvaw.pdfIn PDF document text
    • http://mosjob.ru/images/file/20840443428.pdfIn PDF document text
    • https://kingwrapcarspa.com/upload/files/xinenipudovilowilevagomu.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/7725984804.pdfIn PDF document text
    • http://lecostationery.com/files/file/7939607732.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/lajal.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/lexigipokagefotujovi.pdfIn PDF document text
    • http://kgmda.com/upload/files/18391482990.pdfIn PDF document text
    • http://446888.top/userfiles/file/67720400901.pdfIn PDF document text
    • https://actorconseil.com/files/file/vewamosuduwusuma.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/fuminirebozigodolelos.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/1205820272.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/9bc7d40f8095316ce8cc89be47698fed/23882608153.pdfIn PDF document text
    • http://vtaky.sk/media/file/wimirezijalokixijezifa.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/vijefuwijujukaxinijin.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/47972986722.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=loving+emily+full+moviePDF 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_off0000b626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB626 10268 bytes
SHA-256: d9880d5731e05592e357a68180928da86865a79ddc0ad3e2b7eff7c5b0ae591d
font_01_sfnt_off0000cd32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD32 16704 bytes
SHA-256: 01884b231d3ccfbadcdf4aad092795f0be412ceacfbc904993e5fa2412af9402
font_02_sfnt_off0000f7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1