Malicious PDF — malware analysis report

Static analysis result for SHA-256 596d624122da51e0…

MALICIOUS

PDF

89.1 KB Created: 2021-09-08 20:52:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: aeba327c40e13550fdbc468106352f1b SHA-1: 7cf73d059dfe452abd3bab6391c7ae6e4f06ecc6 SHA-256: 596d624122da51e0c241f19d68f64fa4265284f03ff3aba3620c9004a406f526
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, and is identified as a link farm. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to obscure the true malicious destination by using redirectors and numerous small, distinct domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://philabc.ru/uplcv?utm_term=visualizing+and+verbalizing+manual PDF link annotation
    • https://ambient-interier.cz/files/files/97846870223.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/64199929059.pdfIn PDF document text
    • https://digireg.li/upload/madifulurokorifodejoxat.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613340d5686a3---22300141025.pdfIn PDF document text
    • http://only-svet.ru/upload/files/88027144576.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/12255550706.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210908_013603.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1630831772_1.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/96130548767.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/mureguzavewavimas.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133ea7a9efb5---wagojumezajeped.pdfIn PDF document text
    • http://isgsrl.it/images/file/pavaxuwunidumed.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/11726198250.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/jimage.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/49157629278.pdfIn PDF document text
    • https://agermag.ro/mm/file/64347359743.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210905204429.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/12002099625.pdfIn PDF document text
    • http://seritour.com/rsm/files/manuxewotafodozosisoki.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/92058101401.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/fejefube.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/83195105944.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/36322995953.pdfIn PDF document text
    • https://conrays.ru/f/data/xumavoxesenawinixowape.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_off0000f5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BE 18752 bytes
SHA-256: a4d920c14998ab817074bbb8cdb2b61888b721361869d5b2d3e93c0322de9955
font_01_sfnt_off000126cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EE4 10708 bytes
SHA-256: 8d34e17923cca94a6057c78d3c1a21a0e26e2d32883ff670c310c76b57c9394a

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