Malicious PDF — malware analysis report

Static analysis result for SHA-256 b832fe14c61cf668…

MALICIOUS

PDF

80.1 KB Created: 2021-09-15 22:29:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 48112369a27e8040b5a111e7872d4d4e SHA-1: c84299d558ce5d3ba3248e68fdba00a933b0c6de SHA-256: b832fe14c61cf668a24a1ff26224754b4e26c50219e00bb7b4191c29139c7427
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous embedded URLs pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a non-clustered link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=how+do+you+set+a+ringtone+on+an+android PDF link annotation
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d119f12687---12578488658.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16140a76e03e91---43330030846.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/vofumixagi.pdfIn PDF document text
    • http://ipllaser.in/uploads/10222665843.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/lubobimiwa.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/39570696067.pdfIn PDF document text
    • http://baove247.org/upload/files/fediwu.pdfIn PDF document text
    • https://kvzriu.org/images/file/saxedunevilipanoko.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/58221771174.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/34641471760.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/58373419866.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210908202917.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/nuvurunolagejaribokas.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/xojetofupo.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/remuroganulijavemodom.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/nexawamoxebuvalafibapa.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/lugabeneduvogilikem.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/linodesudinirezira.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/18260689443.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210914140914.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/67803879311.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/tepigekejipowidipirebow.pdfIn PDF document text
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/6153295028.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_off0000d5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD1 10668 bytes
SHA-256: 4a907357cd8c132e52b4f7b85b91864ae46c71eb3b413ea8e48012a8ccef97df
font_02_sfnt_off00010634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10634 17184 bytes
SHA-256: 248682f104a76aaf8868384e1f4a9325f42b4bf853debfc821aa53215abd677b

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