Malicious PDF — malware analysis report

Static analysis result for SHA-256 64629681c0d375ed…

MALICIOUS

PDF

84.5 KB Created: 2021-09-18 18:37:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 983999a2c3aab045ca2bd557ade10913 SHA-1: d7bb005a9c9d6ff2bf929d7ff3f5112cc401d90d SHA-256: 64629681c0d375ed0a40bb0d4c58cd36085c87b2fe603442df85fcf339feff6b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating malicious intent. The ML classifier and ClamAV detection strongly suggest this is a malicious PDF, likely used as a lure for phishing or to distribute further malware. The presence of a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://villa-carlshorst.de/sites/default/files/file/guwivegab.pdf In PDF document text
    • https://sharjahcements.com/images/bulk_images/files/43862164117.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/74071436296.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/21061053058.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/vuresisezirozef.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/vudonesixosupa.pdfIn PDF document text
    • http://marktoby.com/akram/know_news/admin/userfiles/file/62033177228.pdfIn PDF document text
    • http://aptekadc.pl/userfiles/userfile/88416737227.pdfIn PDF document text
    • http://cermak-expo.cz/data/files/file/veponitonezomagezizaxuwol.pdfIn PDF document text
    • https://ud-hobby.com/images/Upload/file/87231956128.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/ruratenetaduj.pdfIn PDF document text
    • https://sapthagireesyathra.com/userfiles/file/bisidadibelitulorisa.pdfIn PDF document text
    • http://caigeshi.com/uploadfile/file/2021090304340473499.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/58249804344.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133489eac833---mitesajawujafimebelajafo.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/rilofivebakula.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/0f50368fc73f64d78e501d78e6c08f97/lamatidatus.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210912141414.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/vojizalodovekip.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/57289426054.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/62986339843.pdfIn PDF document text
    • http://posuni.com/userfiles/file/wumamudeferomedasuvow.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/pubisedeme.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=reface+premium+iosPDF 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_off0000e4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F5 18468 bytes
SHA-256: 9840eb5c9502757943328f523c322f716598d60a6f69fa9590b9562e6b09a0f6
font_01_sfnt_off0001147d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C94 10540 bytes
SHA-256: 2d5bb256cf766908d46639e168438e661d951aca9c1a2d3bcd60fcc0b2c91557

Open this report in the interactive analyzer, or submit your own file for analysis.