Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f121dd4621a6f08…

MALICIOUS

PDF

80.9 KB Created: 2021-10-13 10:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bea0b8cbf50ced81ef1fb567f9e7879c SHA-1: 9aa55b2a805b2a25c244fdab3732436a0469a31f SHA-256: 5f121dd4621a6f08211b5ceaf2b34957d40a918aa8aabdacd633f84cd89ea307
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to PDF files hosted on potentially compromised or malicious domains, suggesting a link farm or redirection mechanism. The PDF structure and embedded content, while obfuscated, are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://gpsputhuppally.com/userfiles/file/sivar.pdf In PDF document text
    • http://dokumsuzgec.com/userfiles/files/lekamodur.pdfIn PDF document text
    • http://vattuxaydunghl.com/userfiles/file/guzitiga.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/73519046305.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/16952109050.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/divobureralesolo.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/27676111113.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c3627ea161---vinodo.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/67706187395.pdfIn PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/72771852684.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/59662c0440004d139c9b1a052fa343d4/mawazoxexujam.pdfIn PDF document text
    • http://webs.eusko-ikaskuntza.org/files/galeria/files/51922087660.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/xalugogenexagiv.pdfIn PDF document text
    • http://peter-scherer.de/userfiles/file/92110499345.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/82335841788.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/97510649392.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/botasewomawej.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/sowedobaxavisip.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/33312760253.pdfIn PDF document text
    • http://haki.tincorner.com/uploads/files/32090715164.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/divoboparovovave.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/pezuzozes.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/80489118416.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/2I9n2o-U8HI/uplcv?utm_term=the+two+triangle+shaped+gardens+are+congruentPDF 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_off0000d486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD486 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC98 18320 bytes
SHA-256: a367e4a7196175736265756b7fef18083361dde9fc3072e95cb918502f11843b
font_02_sfnt_off00011c7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7C 10940 bytes
SHA-256: bed56b5ba2ff329ea48bd95e4f3a5fa4910aade7de3e0f1785b2daafacb45ab7

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