Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f01ab1c74935a34…

MALICIOUS

PDF

83.6 KB Created: 2021-09-20 16:14:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: b632e7cd60b3e1bc66d8615b41d97ca6 SHA-1: 7474d2945ee7cf868c2c3ecb0427f2a04298ba42 SHA-256: 1f01ab1c74935a34c49be72b61d4c119590ebba59fe68dfcaf766ff6766ef5b5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://virtrade.gr/userfiles_lybo/file/jomipivimovadivogip.pdf In PDF document text
    • http://indago-rovigo.it/userfiles/files/nedebitu.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210914083104.pdfIn PDF document text
    • https://gamepinleri.net/calisma2/files/uploads/muvavixewipewivedobus.pdfIn PDF document text
    • http://scpt.it/userfiles/files/24798164422.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/59521398339.pdfIn PDF document text
    • https://samyenngochoang.com/wp-content/plugins/super-forms/uploads/php/files/nl0leivmbn722u672o62qdoljf/41245030193.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/nevedusuzapiran.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/kexenuw.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/zekiguvok.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/35857689840.pdfIn PDF document text
    • http://npas.ru/pic/file/18154571342.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/61040192714.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/jupijejeriw.pdfIn PDF document text
    • http://szwygs.com/upload/18692240992.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/vaxotumezujogijutajawal.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/59685494471.pdfIn PDF document text
    • http://icbiz.ru/userfiles/file/17923878590.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210907110105.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/15743666905.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/tenixem.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/40370642619.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/vebezukomole.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146eed16319e---fofabosupa.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/69488014959.pdfIn PDF document text
    • http://marisqueandopremios.com/campannas/file/buraxoziruna.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=kiss+of+war+hack+mod+apkPDF 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_off0000dd90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A7 10676 bytes
SHA-256: 3fbac4986e7a0dd321aa5fffaf9c6b2ed9605f7d8b04bfd0dda6c51e05117e50
font_02_sfnt_off00010e35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E35 18600 bytes
SHA-256: dfaeef1ecc815a96ea318235ebacb23e2b6b0df2753a313a0746ba554719769a