Malicious PDF — malware analysis report

Static analysis result for SHA-256 4250c36c3de62a90…

MALICIOUS

PDF

77.7 KB Created: 2021-02-22 05:42:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 10f3d899588acbab0f43e39de0c83ce7 SHA-1: bea01e8a30c5f14d166ed2c21dff19f9b60401c9 SHA-256: 4250c36c3de62a90a4b7beee083b20c4ac663831fb33fa75fca5ae13ae48723d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/strik?utm_term=what+do+chinese+lanterns+symbolism PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369336/normal_60109d9038307.pdfIn PDF document text
    • https://mabobuloxulekev.weebly.com/uploads/1/3/4/6/134692970/3a66fd1e3.pdfIn PDF document text
    • https://ninuxegomozul.weebly.com/uploads/1/3/1/8/131871835/9829c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494891/normal_5feea050f41c4.pdfIn PDF document text
    • http://varistop.site/rak_vitrified_tiles_catalogue0kn4j.pdfIn PDF document text
    • http://rubeatyshop.xyz/cadence_allegro_16._6g1v91.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388407/normal_5fc889f0ab7ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476751/normal_602042df91ff4.pdfIn PDF document text
    • https://wuzovogupo.weebly.com/uploads/1/3/4/7/134720757/9835040.pdfIn PDF document text
    • https://subokolabipu.weebly.com/uploads/1/3/2/3/132303028/fizuruzejipew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382003/normal_6010ef227c61f.pdfIn PDF document text
    • http://zosujobitusup.iblogger.org/what_to_do_when_netflix_says_error_please_try_again_later.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pejefovad.epizy.com/dumosemaxadadiwiz.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/steam_api_dll_pes_2017_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/canon_pixma_ip8500_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/remufuzu/9609986797.pdfIn PDF document text
    • http://tovajukoxeboder.epizy.com/chu_chu_tv_songs_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/semi_formal_white_dresses_plus_size.pdfIn PDF document text
    • https://s3.amazonaws.com/sefepugolupalax/89496655525.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ded2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED2 5768 bytes
SHA-256: 11089310276b915a5e50096ca2cb9fdb588710692b40e5744053d87bc501b09d
font_01_sfnt_off0000f2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A4 5436 bytes
SHA-256: ed38c9696b254d8a9eeec53000a46ac923512f671d10d4bb20d592cd77ef33a8
font_02_sfnt_off00010503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10503 10976 bytes
SHA-256: 9187d6b222e5264d77543f496a104d79d173cf36e17602333ff82c1067850519

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