Malicious PDF — malware analysis report

Static analysis result for SHA-256 431836fb1a82e3fd…

MALICIOUS

PDF

70.6 KB Created: 2021-06-13 18:15:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e143edd0d46e0260726ead0c43a30f2c SHA-1: ee1bdf0902a52654d41093308ec70a4b49eee8c3 SHA-256: 431836fb1a82e3fd3dc2b18c3263f9f6b9e86898a88e3b7597ee15f7e3326328
126 Risk Score

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 0.9992

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://catamma.ru/pbw?utm_term=html+to+pdf+with+images PDF link annotation
    • https://jupufafel.weebly.com/uploads/1/3/2/7/132740723/ruzexibuv.pdfIn PDF document text
    • https://bobiguwifuza.weebly.com/uploads/1/3/5/9/135966914/kezaxulotivinim-kegepezaku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476152/normal_6001286a04f54.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385424/normal_5fe41bab60293.pdfIn PDF document text
    • https://tiwokixaxuvap.weebly.com/uploads/1/3/4/2/134235176/pujapopida.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388815/normal_6056fcedeaf1a.pdfIn PDF document text
    • https://zokunokakepano.weebly.com/uploads/1/3/4/3/134353677/sekarejolibukedog.pdfIn PDF document text
    • https://kolivobaka.weebly.com/uploads/1/3/4/5/134500933/32ff6c731bf07.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bolejagum.pbworks.com/w/file/fetch/144895803/50398221395.pdfIn PDF document text
    • http://vikiruji.pbworks.com/w/file/fetch/145173333/midefe.pdfIn PDF document text
    • http://pakaguwazu.pbworks.com/f/twilight_first_book_release_date.pdfIn PDF document text
    • http://runuwitol.pbworks.com/f/fire_fire_mod_apk.pdfIn PDF document text
    • http://rujuboxu.pbworks.com/f/binomial_formula_for_negative_power.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3eea3d9-09c9-42e6-a0ec-ba6b3e837c15/oru_vasantha_geetham_full_movie_download_hd.pdfIn PDF document text
    • http://zizovitunex.pbworks.com/f/63843141559.pdfIn PDF document text
    • http://marutipug.pbworks.com/f/3931976131.pdfIn PDF document text
    • http://kinuwibe.pbworks.com/w/file/fetch/144444141/78609726526.pdfIn PDF document text
    • http://gipomebepate.pbworks.com/f/54131000379.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82bff641-c167-458f-82e1-d0875a2ad33e/xonorubonudakakudekavi.pdfIn PDF document text
    • http://zemenifinabe.pbworks.com/w/file/fetch/144574854/cdigo_de_processo_civil_2015.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2df92b6-f368-443f-b0b7-31a5a6e2854a/cdigo_processo_civil_comentado_daniel_assumpo.pdfIn PDF document text
    • http://zedilowozare.pbworks.com/w/file/fetch/144652590/xodugod.pdfIn PDF document text
    • http://jebodigezev.pbworks.com/w/file/fetch/144530139/can_you_get_a_marriage_license_if_you_are_illegal.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EF 5412 bytes
SHA-256: ed839190850040ca83ddb7f4c5141998d6f1c884a146ae2a2aecc25a7ad11a39
font_01_sfnt_off0000e84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84D 10948 bytes
SHA-256: 10fdc3b76d74294de0783324a038e02a61b56b18bc9a6a03011c013792b20153