Malicious PDF — malware analysis report

Static analysis result for SHA-256 333868b1f6fc6f5a…

MALICIOUS

PDF

82.4 KB Created: 2021-09-18 23:13:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7f5e6aa6ba6f560a8ca3b5bb1f6c29fa SHA-1: 78a68ee3ed873b1f670b964d29e3a65797b44776 SHA-256: 333868b1f6fc6f5a785addb109f8e28f22137abf3ed1a82751ba20d40fb7ecea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external sites, many of which appear to be part of a link farm hosted on disposable domains. The primary function seems to be directing users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=kissing+booth+2+free+stream PDF link annotation
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdd219d5ce---getafa.pdfIn PDF document text
    • http://wwsm-us.com/files/file/4654473686.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/zodewa.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/85484115187.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/67913838529.pdfIn PDF document text
    • http://hcm-invoice.vn/hinhanh_fckeditor/file/fefupezu.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/46293033273.pdfIn PDF document text
    • http://krcatikyonetimi.com/userfiles/file/weralumusorimevenagar.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dowamozurasenasowumuro.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/vujanikuxudofaluz.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/51235767559.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/dirupetajonela.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/95512401979.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109152006442877.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372c5633d6d---zesividan.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/jojuxineredabasavefi.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/54403572368.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/dedigobuwakubuz.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/96473305230.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/45029404828.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210906101955_aaps2o.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_off0000da58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA58 18736 bytes
SHA-256: 29b70958804851eb9a7baee19f36ee3f9c433644786cb0abf15e9c2aeda2daf0
font_01_sfnt_off00010afb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12312 10864 bytes
SHA-256: a00711ed78d805975b177c0c3b2bf04ebeac6f33ce35fe96c4cc29a1013fc1d2

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