Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ec8be04c773de2e…

MALICIOUS

PDF

69.8 KB Created: 2021-09-12 03:25:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 483876de5652c1d39d309d7acf940869 SHA-1: c94c41013c8c5b6a6f1a9171cb16426cf05eadc0 SHA-256: 3ec8be04c773de2e80671c78c61ad669dfe7934b21d1a851176e276910bfb540
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to direct users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://linhkienhunganh.vn/luutru/files/5333500931.pdf In PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613116e30b614---nugesu.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/49495742624.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/juwagitus.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/37040483147.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/da27a77fce6f5337cdb487aa473a859f/nonagexatumelafexonufafu.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/mavujezorozuronoba.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/birugevofuwapoxo.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/sovudetatusujuzozenapo.pdfIn PDF document text
    • https://patc.fr/imagesfile/78829505708.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/17148718230.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/xelunejemolevo.pdfIn PDF document text
    • https://webmenuplus.com/images/file/begexowamolutaxojixo.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/17820596040.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202192915265189.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=fifty+shades+of+grey+darker+onlinePDF 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_off0000ad64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD64 10816 bytes
SHA-256: a374ba0c978cbf1ec186e306482a74f225f52a25f07b617987926bb88278f9f8
font_01_sfnt_off0000c60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC60A 17216 bytes
SHA-256: a092c6ad86f51c1ec57707c5c72478ec6cea93110af16a6fb4afaaa826e85727
font_02_sfnt_off0000f26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.