Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f243e1a82bb43ee…

MALICIOUS

PDF

82.0 KB Created: 2021-09-17 14:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 33e4a7e26ed7815c3b504eeaa6f13ad8 SHA-1: 32d56d3492d009574967644c0e47f24e8a1b34f5 SHA-256: 7f243e1a82bb43ee443471a8292927bdc7233c6c5471223419fae074a70d972d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to potentially malicious domains, and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a deliberate attempt to create a link farm. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest a phishing or malware distribution lure, aligning with Spearphishing Attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://inwebjor.ru/uplcv?utm_term=123+free+movies+official+site PDF link annotation
    • https://aedwea.com/upload/foto/fegumunamin.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/teluvivu.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/46482381246.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/55148421121.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/xuxedumagexuna.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/pulutasepavujodufulegike.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/75738938166.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/56040737314.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/78370995028.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/zuxesabimuxipibifo.pdfIn PDF document text
    • http://honghuibio.com/d/files/26616106340.pdfIn PDF document text
    • http://skomi.ru/img/files/file/86910375093.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/i19q9paq4p8kf8mgkv03c6ush4/jinifowarafuba.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8ab7e750b---57327843811.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5565379416.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/dokeziwuvozoxo.pdfIn PDF document text
    • https://kaparatt.com/images/File/95281794176.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/10967212208.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/49599381933.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/49763057072.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/zumemejirevag.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_off0000dda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C0 10704 bytes
SHA-256: 8cc3c02d014afd63f14376f418d5a41cba6466b60a55f246c7e63e4024e7f1c4
font_02_sfnt_off00010e77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E77 17180 bytes
SHA-256: 16d683c4c5d11d12f8ba914ca52bf94a59f4553bb0535a6c05ebb9868d4ecb94

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