Malicious PDF — malware analysis report

Static analysis result for SHA-256 31634444875dabaa…

MALICIOUS

PDF

95.3 KB Created: 2021-09-13 13:24:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 333a467918226f89f1098c72733f2743 SHA-1: 4ac948597ba0490b470f9a81206b89286846a110 SHA-256: 31634444875dabaa4889c2d1ad56b13fb0637b6f91a59a37f8aaf74373104399
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing attack, likely using a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://www.jasolasia.com/image/upload/File/69614915621.pdf In PDF document text
    • https://satesayap.com/contents/files/89179208687.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/58938711936.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/tederezugagogotabunoja.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/lobasugetekuwukax.pdfIn PDF document text
    • https://rugsdirect4u.com/uploadedfiles/file/jemomurupuzezubupi.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/lasig.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/gme77c3mcm2btisaae3a0c3j1v/23364395863.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/9556140088.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/detisogemekiv.pdfIn PDF document text
    • https://icbacademy.com/upload/files/tekitur.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/9502020925.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/17170110724.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210912055448.pdfIn PDF document text
    • https://cuatudongbinhduong.net/uploads/files/marakepobusizonubomibekor.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/ralijixosiwijogifufezudax.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/16378276532.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/xivugorefu.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/gafuzakegi.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109120341319339.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/38157126010.pdfIn PDF document text
    • http://avesta-hmora.boj.se/uploads/userfiles/files/nefujifokeb.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613e70b7125ac---mojamapozosaworaza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=poco+x3+pro+ringtonePDF 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_off00010c1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1B 19684 bytes
SHA-256: f47ad755a97ed5bd80c23740c3fb273565e8e998e8724285f18c51887797ee0f
font_01_sfnt_off00013f9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F9D 10448 bytes
SHA-256: febf611459ad66117553d45937c3af6b4affdb4acd90b1e3dc46ef69061b2c0a
font_02_sfnt_off00015780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15780 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1