Malicious PDF — malware analysis report

Static analysis result for SHA-256 58de56535636fda6…

MALICIOUS

PDF

94.3 KB Created: 2021-09-19 19:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 104e7175368dc2c61ede993a2c473d73 SHA-1: a6bce04522d800dac8bc22259cd69512be5e3b31 SHA-256: 58de56535636fda60e95a23dd57197f83d6f4e0f75f8115edabb5c40e6f27c18
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm PDF. It contains numerous embedded URLs pointing to various domains, suggesting a phishing or credential harvesting campaign. The PDF structure and numerous external links indicate an attempt to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://synerhu.ru/uplcv?utm_term=wear+os+2.26 PDF link annotation
    • http://wellnesszeewolde.nl/site/data/ws/files/ralise.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/gogojazagugajujo.pdfIn PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/10409129983.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/f986237cad9c40dcabb021a53d5e413a/91550568334.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/90446716884.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/noxoporofa.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/vomajosuxuf.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/nepomizubotefesidofu.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210914060847.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/fupego.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/xonosomunumimusuvemup.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/tiduvemorokow.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210913/files/20210913015223.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/58856222745.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/52848190583.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/99675124078.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/foziwelumenemobadew.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/41d228a86f3bbb57bda677eccec8ca41/61853336873.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/gumiminepedaruvaxoko.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/wuforepapakalajube.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_off00010ee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE1 18036 bytes
SHA-256: 60eac6d848d25d5f93b71566ec62037e1835555bbe0e9b0d8487dc7a4bd5c9d3
font_01_sfnt_off00013d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000155a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155A4 10108 bytes
SHA-256: c81de472d6319f32898385b9742364efbc39df837a25f60c72c81cc46d18a708

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