Malicious PDF — malware analysis report

Static analysis result for SHA-256 89256f8b08b47b72…

MALICIOUS

PDF

84.8 KB Created: 2021-09-16 20:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 303ca1c59e4415909ce8bece0e02c018 SHA-1: f8a7bcfb266d89aadc7645a44c519bf2ce1beb0f SHA-256: 89256f8b08b47b721c4b264ea71896c1e6bd6010441e59732164ce9e1c4c8847
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. The PDF contains a link farm with numerous URLs, suggesting an attempt to obscure the final malicious destination, likely a phishing or malware download site. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ln80.cn/filespath/files/20210907140003.pdf In PDF document text
    • http://fatimaartwork.com/userfiles/file/zimojavoguzebepafurojoper.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/gudosuven.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__6136D47D1488D.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/24808814700.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/c89c9c4d9b964c50ffa393e444976c92/68283061434.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/nisudisaguneli.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/9677584803.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/jotaw.pdfIn PDF document text
    • https://peusch.lu/userfiles/files/43732710404.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/95366833674.pdfIn PDF document text
    • http://ingore.cn/upload/files/mowiwupimolojomigogam.pdfIn PDF document text
    • https://mptradingcompany.com/userfiles/file/kawuloxukeladaxijiwoza.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/97549367843.pdfIn PDF document text
    • https://undergroundtakeout.com/userfiles/file/bumuxanos.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/31110601419.pdfIn PDF document text
    • http://sns.hu/_user/file/34104535336.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312b81c0b99---kubixe.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/xibozifesizegigimenijo.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/57575647915.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/vibenul.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/86159699645.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/wigufopufu.pdfIn PDF document text
    • http://tearose-kitchen.com/sites/default/files/images/imcefile/vawijafoso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=gta+5+ios+file+downloadPDF 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_off0000e71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2F 17616 bytes
SHA-256: a073041c90d69995bf3f95a1a5b33f46c30d2e5bf1b25d4f89a92b2a73f80d68
font_02_sfnt_off00012c7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7C 10504 bytes
SHA-256: be1c162be08e87c4cfe9310c28e3ef820711360d1b790e5c9dd422500df3117d

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