Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5ca55f58121a964…

MALICIOUS

PDF

86.6 KB Created: 2021-09-23 02:06:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e00f7ec1950ab642d9be88e28112cb45 SHA-1: ba4d14179ba13ad8fa83465d7051bc4275b098a3 SHA-256: a5ca55f58121a9642e09922297ce30d9d96a7bc505a123c7df74ef96ddd0ce75
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1071.001 Web Protocols

The PDF contains embedded JavaScript and numerous external URIs, many hosted on disposable domains, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is a phishing or malware distribution vehicle. The embedded JavaScript likely facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://smidgel.ru/uplcv?utm_term=always+on+display+apk PDF link annotation
    • http://personnelstrategies.net/userfiles/file/90151762206.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/zipusojapexatukedidelopo.pdfIn PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/71741432916.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/53888012609.pdfIn PDF document text
    • http://biosite.ru/images/news/file/18839481021.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/45575037345.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/4516532131.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/70636978401.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/78960715074.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/78481002855.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/40283721410.pdfIn PDF document text
    • https://hometutorsdelhi.com/userfiles/files/wugaverifujez.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/gosafonobebopalavetumosi.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///7229220531.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210911083623.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/814e577ebdc953dd63d3ef472667bacd/48741907080.pdfIn PDF document text
    • https://mavibusiness.it/file/zidud.pdfIn PDF document text
    • https://globaldreamindia.com/webcms/file/tijutos.pdfIn PDF document text
    • http://effekt-film.de/files/file/41193697200.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/14360786768.pdfIn PDF document text
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/xenuxanuzajoxif.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_off0000e9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FE 19936 bytes
SHA-256: 51ec102937046a33733de1330d32f22fc8d7e03b90d85ac943ec909bc390e8b0
font_01_sfnt_off00011dde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F5 10328 bytes
SHA-256: a7267f6d186a580c96fbbe13874c8be18cec5b130ee8a86ae6cc5f695c8db12c

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