Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f50e3aba332c458…

MALICIOUS

PDF

163.0 KB Created: 2021-10-10 11:14:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 5b9ee34f8fc9b0a6244cfb1bb11f31ed SHA-1: 664c62b65b0b31ce31d142711387239d17d8bae3 SHA-256: 6f50e3aba332c4582cca3588d78ec9bda34e9a388a8f7d3972e091480a4bff2c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further indicating a non-legitimate purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://archism.ru/uplcv?utm_term=most+popular+tupac+songs PDF link annotation
    • https://codecs.ro/images/file/44650681287.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/87074660907.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/xotubowilogojafuretalaw.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/86667912451.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/24458768970.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/35823376238.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/faxomegunimeme.pdfIn PDF document text
    • https://electroagro.es/pub/files/fejal.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/95924594095.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/kitarisonet.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/91309408223.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/8lh3j211ggf169bli10cobp42g/satozuzofazexib.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/pozanenigiziserevovuzi.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/74886711889.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/fadewodula.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/nutapejiximipojiripuge.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/lamejubenumedigido.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/13490428807.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/19749864317.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/gatevepekibe.pdfIn PDF document text
    • https://ms2oke.com/contents/files/99350506911.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_off00021590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21590 22012 bytes
SHA-256: bde5506ce0eb43db5e5ce478db85d2740aea4a7f87c98f477eb08f1289fd2f89
font_01_sfnt_off00024dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24DC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000265df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x265DF 10420 bytes
SHA-256: 640bfa90b407df3a5b2d5ee58d3ed20d837d42547f01f17db14f612f61844cbf

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