Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbe35e1b68d24a01…

MALICIOUS

PDF

82.4 KB Created: 2021-09-11 13:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4dc273fd0a4415743d64912583363273 SHA-1: fec824b60cc9526ba8a32e46c159e245f44b40ba SHA-256: fbe35e1b68d24a01b5c5607cccbb53076a3f58256a14d2ca5f89b5abcf7937fd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is designed as a link farm, pointing to numerous external URLs, many of which are hosted on potentially disposable domains. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm heuristic strongly suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://pacpartner.net/images_client/imagesfile/1990222339.pdf In PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/30946987071.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/jagotopugijudax.pdfIn PDF document text
    • http://npas.ru/pic/file/20106700630.pdfIn PDF document text
    • https://intersat.lv/files/file/jefomegu.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210906_224742_102.pdfIn PDF document text
    • http://chithanhplastics.com/uploads/userfiles/file/83750215842.pdfIn PDF document text
    • https://gestcargo.com/uploadfiles/file/22664418669.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/1e2f2476942341fd8251822f6f00b502/nilumivikovibosubuva.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/c231f553c66f4471995bcb874343d3fd/8371071047.pdfIn PDF document text
    • http://dominant.name/userfiles/file/96479453070.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/73036123858.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/manekisejesix.pdfIn PDF document text
    • https://j26clean.com/upload/files/20655182113.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/regiberazizidem.pdfIn PDF document text
    • http://palami.by/images/file/87182083859.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021090216523869.pdfIn PDF document text
    • http://vrajacreation.com/uploaded_files/userfiles/files/wejunoxur.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/55916932899.pdfIn PDF document text
    • http://offerparts.com/upload/files/suborabelamuzaxalib.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/kawemepugamuzoro.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/rutepulamirokajugobejir.pdfIn PDF document text
    • http://bikaji.zohukum.com/ckfinder/userfiles/files/xowusupisifevural.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/92178534416.pdfIn PDF document text
    • https://baglab.pl/galeria/file/maboxilefutubaburumej.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/zolejo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=genshin+impact+free+primogemPDF 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_off0000dc56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC56 17840 bytes
SHA-256: 99ce569736612803f4c0fa3f1a8986cc28ab32bd5165e58bf0ee66c86d2462bf
font_01_sfnt_off00010a7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7E 10920 bytes
SHA-256: cd2789a5a9e0b36bcac31839529ca7f9bbaba4c34b562a7c60cdf11beedd2911
font_02_sfnt_off000123a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1