Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a55c5659f7179cd…

MALICIOUS

PDF

70.7 KB Created: 2021-09-29 12:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 71098d64d04b049b4d1ab84ea5d0f0ef SHA-1: 0133e1851def6aab244bcf9fc7b8432399325a24 SHA-256: 9a55c5659f7179cd7e69f5ece6bb4bc805810451c7dec2e3aa670d31d1a1ff3f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics indicate the PDF acts as a link farm, directing users to numerous external websites, one of which is associated with a suspicious URL containing 'utm_term=all+the+best+full+movie+download+480p'. This suggests a lure to download malicious content or engage in phishing. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://huntic.ru/uplcv?utm_term=all+the+best+full+movie+download+480p PDF link annotation
    • http://jimsclub.net/new/board/img_tinfo/file/20210920030618.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/ratiwewudopuk.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210925132136.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/jemipoxarosenunivuzur.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/favibelel.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/lubupu.pdfIn PDF document text
    • http://mytrangroup.com/uploads/userfiles/file/vokel.pdfIn PDF document text
    • http://geraldinekilkelly.ie/faxanumulezuvijopevamen.pdfIn PDF document text
    • http://jinyezi.cn/upload/megagulodikagarozebin.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210924_045437.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/98727428979.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/39189763016.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/80583804169.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/65088432019.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/kotoz.pdfIn PDF document text
    • http://nagyberki.hu/sites/default/files/fck_uploads/file/mugusoxerim.pdfIn PDF document text
    • https://kratky.eu/files/file/60167784179.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/govegazosidovodajirug.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/bofeledimaxolinorixut.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/zolodumudivepuf.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/jebizeri.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_off0000b020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB020 11444 bytes
SHA-256: 3f0d6f9b6c0885479618550dff4cee9b1d6c25de5bd8e404e4c8f8317eff89e2
font_01_sfnt_off0000cae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F3 16388 bytes
SHA-256: 00bdd3f111a7ee303ef8f2fdef5ce7e13d51956a52f93c46f30b44eec97643da

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