Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb9ca470167ba1ae…

MALICIOUS

PDF

75.2 KB Created: 2021-03-15 16:24:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ec138a62aaa0440f8de3df8ce0587c45 SHA-1: 55b9a8080aa74621c384710e9ab7dc8850b1fa59 SHA-256: bb9ca470167ba1ae3a8d32ab2bc202314bca13458ebf65536eb1c8e017d70b3f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://maypoin.ru/strik?utm_term=tonersammelbeh%25C3%25A4lter+xerox+7855 PDF link annotation
    • https://jupavovol.weebly.com/uploads/1/3/4/3/134314217/gogimame.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465685/normal_6033b986b9287.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369656/normal_601b2e00be647.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4859805/normal_60345407b5775.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388596/normal_601dd124474e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491151/normal_60373e25929cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471273/normal_601e80d1e12d1.pdfIn PDF document text
    • https://xudodezepemixol.weebly.com/uploads/1/3/1/3/131398406/a8ed1b.pdfIn PDF document text
    • https://zasoliwex.weebly.com/uploads/1/3/5/3/135318241/9736007.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453537/normal_600279e73727b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494139/normal_6031548754d5b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410204/normal_5fc9c773dc51c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lapobikajedive.rf.gd/lebodividadem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a4bfd80-583e-4652-ab5f-9e37b8c5634f/biblia_de_estudio_arcoiris_reina_valera_1960_gratis.pdfIn PDF document text
    • http://wilunimexa.epizy.com/sebarukivobexetasadaje.pdfIn PDF document text
    • https://s3.amazonaws.com/kijelopazekune/grass_word_origin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/370ca07f-da3c-43ea-9712-b8fe84717af3/dr_seuss_beginner_book_video_hop_on_pop_youtube.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/girl_guide_brownie_uniform.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/295a2996-2e3c-4c33-b4f5-bf4af1672ad4/original_cinderella_book_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/304336a5-120f-4250-99ce-7fb874471ce0/2125219911.pdfIn PDF document text
    • http://vowelilo.epizy.com/sherlock_holmes_movie_download_in_hindi_720p_khatrimaza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ec9586e-d67d-49c6-a219-9ea66c8b08e0/gps_map_62s_garmin_manual.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_off0000e309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE309 5716 bytes
SHA-256: 485800db54f783008c398c6e3e9a42fdb16a7a48426e3e14aa1d962fbdbe01fc
font_01_sfnt_off0000f5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CB 12004 bytes
SHA-256: c5f91881d033ae12acd84a79bac4eb3f0a9a9aa874cf7cd777f2c432271c8307