Malicious PDF — malware analysis report

Static analysis result for SHA-256 24cdb001e9259ffb…

MALICIOUS

PDF

86.7 KB Created: 2021-09-19 18:16:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: fa312ceb38b2d5496c6b6816730f9a9a SHA-1: 837783cd7b126bbb58a555a577d50c387500457c SHA-256: 24cdb001e9259ffbac52ba58791f526676365ca7176664ce603e5315d27cbf5b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=avenged+sevenfold+so+far+away+solo+tab PDF link annotation
    • http://nexxosrealty.com/userfiles/files/6781245163.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/kimanogukebibetobonakuv.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/doxagifufupal.pdfIn PDF document text
    • https://advantage.ee/media/contents/file/59046494403.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/33754380116.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/58153187874.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/68935412171.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/93492841985.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/tururugibenolebafamiri.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/96876766387.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161309148e3a31---denijeduv.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210903072757.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/sikakemevegepegaj.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_11_07_08_59_8801.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/81053762989.pdfIn PDF document text
    • http://kasargod.net/uploads/file/56574438480.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/puroj.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210910125410.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/jogotavidapejev.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/nekolebefu.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/42999585842.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210912021451.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131bec6070a0---bapalenepifa.pdfIn PDF document text
    • https://btegypt.com/file/55014635597.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_off0000ea55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA55 10824 bytes
SHA-256: 758931df7b48646d8fd3286cd8b6b1a99596f874da08105878410ca889a79692
font_01_sfnt_off00010367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10367 18516 bytes
SHA-256: f8230dc45f3de5d62a4558fda45b2ca726acda9fb9f9d6a7212bcbbb13b8799b
font_02_sfnt_off00013476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13476 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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