Malicious PDF — malware analysis report

Static analysis result for SHA-256 7adf71ecf5e64360…

MALICIOUS

PDF

85.1 KB Created: 2021-09-20 22:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 94bfacfea312dfd7ec16ddc742519c03 SHA-1: e22bd62c0c89676c678a7b692c96ec0e752d4bc6 SHA-256: 7adf71ecf5e643602d718d9cf6f370efdcf520147463edf2641f8c23d86d8cc7
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this is a phishing or trojan delivery mechanism. The document's structure and numerous links point towards a link farm or phishing lure, likely attempting to exploit PDF vulnerabilities to execute its embedded scripts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=android+10+help PDF link annotation
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/28311780199.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210918150526.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/36998225880.pdfIn PDF document text
    • https://akemi.ro/hirek/file/wurozafusifix.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/jarifotigep.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/laluzobegosi.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/zubadibovonipukuk.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/lefapekuvebixami.pdfIn PDF document text
    • http://novastal.pl/userfiles/file/91427519402.pdfIn PDF document text
    • https://polenhosting.com/calisma2/files/uploads/nulirugisusuragesif.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/14423329808.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/51039433242.pdfIn PDF document text
    • http://gdgom.com/upload/file/21090116513142462181sd83x1s2kg.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/63929739290.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/14726434759.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/79052962803.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161457d9dea9d0---bogudosirulazapuboz.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/8658732749.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/71453816947.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/55934071551.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/xezugipolilasesawere.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/xijimigujosofuniranide.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/3f625f4dae0eb189cebffaf4167176af/9950250800.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/25897564600.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_off0000eb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6B 10216 bytes
SHA-256: d953a1477c2f3f4cc4a9d7fcce30533eaa6c23693e7ccc57f353f2d2cee5d22d
font_01_sfnt_off00010223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10223 17296 bytes
SHA-256: 1779fb6d2e532fd25342c606d9e9db522d2acc4b897c6eb4857bd94481ba50e9
font_02_sfnt_off00012ed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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