Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4f4de7823d973c2…

MALICIOUS

PDF

83.1 KB Created: 2021-09-19 07:16:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cd0827cb626cac653d4bc1306e6f3bdb SHA-1: 60e5f6f36919305c5d7f2ef96fa48c028c84e4ba SHA-256: f4f4de7823d973c259dd4fd44dca25cfc6906fb49d6e62d458da2b3d2948a2ff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm or phishing campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a large number of links on disposable hosting. While no scripts were explicitly extracted, the nature of the embedded links and the ML detection suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://martabaktelor.com/contents/files/vijewopu.pdf In PDF document text
    • https://gemma.lucien-sv.info/uploads/files/6138a5086aea0.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/lezojurogezopomeb.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/wosidobigofa.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/kokuduwejiwobeg.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/navekevilisebonepafo.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/poridosejezonigekosa.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/lisevedu.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16136498a75377---ximekiduvused.pdfIn PDF document text
    • https://pr-dienst.ch/file/62699616996.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/midunedu.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/badowij.pdfIn PDF document text
    • http://ariogalospspc.lt/userfiles/file/visixodipirafevedakor.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/19429570374.pdfIn PDF document text
    • https://argumentua.com/i/file/61668759267.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/22608905412.pdfIn PDF document text
    • http://apartamentosalbatros.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144417323dd9---27145806932.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/96093361109.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/7582196262.pdfIn PDF document text
    • http://jafra-com.at/userfiles/file/45820573821.pdfIn PDF document text
    • https://hsse.cl/files/41640823944.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=apk+csr+racing+2+hackPDF 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_off0000e1d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D4 17624 bytes
SHA-256: 527dbf55c754c86a5c1a2af22f1fe24ec882661337994bea62c4c4ec30d0241d
font_01_sfnt_off00010f74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F74 10452 bytes
SHA-256: 7060e300cea4f468b347feb7039b76086fd84ac5f33c344302e8990814887b77
font_02_sfnt_off0001272f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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