Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8ae189073e75b87…

MALICIOUS

PDF

74.3 KB Created: 2021-09-15 21:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1655b4e77607026e614975b7cbb1bdba SHA-1: 6d4359828e607a9133974a2bc27b3f7265b69e63 SHA-256: f8ae189073e75b87498e7aa5ecde5f5d3f9f6675c8a026bf44f46ebf889e876c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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 http://simp-q.ru/userfiles/file/85213129146.pdf In PDF document text
    • http://skolky.info/foto/images/file/geredovuvav.pdfIn PDF document text
    • http://congtyvima.com/images/Download/38033726348.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/lasidufaveja.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/73571282599.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/96389584902.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/59015835120.pdfIn PDF document text
    • https://raljob.com/userfiles/file/95680943243.pdfIn PDF document text
    • https://giaynangchieucao.com/userfiles/file/vozerur.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/21957574209.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/81590144584.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613525c4af2a0---raxipekavodasobiw.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/25907467794.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/xatukunazaxoj.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/81005697482.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/10246976292.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/10205700414.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/46258202878.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/35329816547.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/fizoxikumobojomomusu.pdfIn PDF document text
    • http://gotween.com/userfiles/file///38595756919.pdfIn PDF document text
    • http://jgweld18.com/UploadFile/file/20210903021350456.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=emoji+iphone+for+samsungPDF 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_off0000bf87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF87 10872 bytes
SHA-256: f4838c58826392498ac848226b1dd99b765cc1d0c1c56dfc1134f9806943035f
font_01_sfnt_off0000d858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD858 16796 bytes
SHA-256: 2bbe582cfc336aac35a38faf8fd61c88e7b33706b9d34ed9cbfa1ee7881d4de6
font_02_sfnt_off000103aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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