Malicious PDF — malware analysis report

Static analysis result for SHA-256 d613944254abba46…

MALICIOUS

PDF

83.4 KB Created: 2021-09-14 02:38:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3cd1f90047e4c3bdee66f4143a622cb6 SHA-1: f2b3df8035644b57ac14aaf3b734174e2c732cba SHA-256: d613944254abba46f55167c713d4f0275eb48dc15f1133ce520335055ce19d54
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics identified it as a link farm, with numerous embedded URLs pointing to other PDF files, suggesting a phishing or malware distribution scheme. While no scripts were directly extracted, the nature of the embedded URLs and the link farm heuristic strongly suggest an attempt to direct users to malicious content, likely for phishing or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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.
  • 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://vina2002.com/uploads/files/67885071328.pdf In PDF document text
    • http://hodoan.net/userfiles/file/pazigumiwuwumaralur.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/jajasabujude.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/86195669279.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/14445100813.pdfIn PDF document text
    • http://oris-am.com/editor_up/33100700249.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/mijuvu.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/65894828837.pdfIn PDF document text
    • http://digifast.cz/userfiles/18951566078.pdfIn PDF document text
    • http://nguoiquangphianam.com/uploads/files/63476737585.pdfIn PDF document text
    • https://bdata.vn/upload/files/85766549760.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/75231643311.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/xumadifiwodugekuwi.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/28474747285.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/87107611311.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/lowelotubusawigujelulos.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/guvewumulesod.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/94347453246.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/dokikenezikomafapuseda.pdfIn PDF document text
    • http://2222.netsociality.com/upload/files/nexarewa.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/vuloloburuvosudizimu.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/72455543956.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/61366882930.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=cara+download+tubemate+untuk+androidPDF 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_off0000e1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DB 17652 bytes
SHA-256: d12dbf700bcc6cd34e7912044074c8ac75eebb6e6c9c0d9a67e2a858145608fe
font_02_sfnt_off000127b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B4 10688 bytes
SHA-256: fdbf8bbb11a57daaa34f826e4bf243bb734537742c6b056917e7b56dc971e9b5

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