Malicious PDF — malware analysis report

Static analysis result for SHA-256 f04b58f82f36b6fa…

MALICIOUS

PDF

78.2 KB Created: 2021-09-18 09:43:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 002558f0a004d9c011e01e9848545a29 SHA-1: ea48aa22d8b17180bd52fb677fdfe374b104019a SHA-256: f04b58f82f36b6fa5414ea2751a5c36dc8141a6492166bb4fd5c2714be0fd3cb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, suggesting it functions as a link farm, potentially leading to phishing sites or malware downloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this behavior, utilizing disposable hosting and UTM parameters to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ketchas.ru/uplcv?utm_term=limites+de+funciones+trigonometricas+pdf PDF link annotation
    • https://ever-progress.com/upload/files/54737690909.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/bexoxazikaraso.pdfIn PDF document text
    • http://sun-apartments.pl/data/pages/jimowebamaxusugomoxiz.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/50176910835.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210918115233.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/pifimopa.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/mesapafuravikinesepedifog.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/wezazebuxiwifo.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/xexomiw.pdfIn PDF document text
    • http://shendaoguoji.com/data/attachment/file/7893827137.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/44805777997.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/3d1b5335744fe7ab8215b5e8ef40b577/76593545178.pdfIn PDF document text
    • https://ekransamara.ru/files/kopak.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/jefiwaxaxamelejurizasozig.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/togovadox.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/pugajutidifewigizemepaz.pdfIn PDF document text
    • https://mollis.rs/files/xodivafiwuledopakuvalaxe.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/48010832150.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/24209155846.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/48155328964.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/derozezajiludot.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/dulisiragata.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/94979050717.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/zamofudupevezimuxosekugos.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_off0000c7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD2 19500 bytes
SHA-256: 29eb7e0752bac51e969b90b2e210ea14e369c45fe0c06ca1a04ae7f359a4e976
font_02_sfnt_off00011172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11172 10976 bytes
SHA-256: 20daf2eca558502015ef819da07277b3b8724ecd311435cb179c61f54d576bb5

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