Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f32bac193a83048…

MALICIOUS

PDF

80.5 KB Created: 2021-06-07 13:22:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d1dd42fbbbb664d47888e0984ee00829 SHA-1: f958e524ffed7cbf1664f25c1d14ec4931509dc1 SHA-256: 5f32bac193a83048330f938ee58af805a3bf93454b3fb3d1817ee31bb6d4c691
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 0.9993

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://catamma.ru/pbw?utm_term=big+ideas+math+geometry+online+textbook+answers PDF link annotation
    • https://wutarodopa.weebly.com/uploads/1/3/4/2/134266687/susazunidag_doxuxazax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406777/normal_604cbd52d2186.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451927/normal_60bb42a961247.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459323/normal_6062ef6815def.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389794/normal_6036d758a3b5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428062/normal_5fe798f809b5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479240/normal_605ad1c3295ab.pdfIn PDF document text
    • https://karopudalel.weebly.com/uploads/1/3/4/8/134881347/xerusuvitepa_rilelokuvizuw.pdfIn PDF document text
    • https://wuziwewaramided.weebly.com/uploads/1/3/4/3/134311070/sutok-ninepunov.pdfIn PDF document text
    • https://fivomatimib.weebly.com/uploads/1/3/1/0/131070631/8615358.pdfIn PDF document text
    • https://webimilosajepi.weebly.com/uploads/1/3/4/8/134859137/11054fcebe8df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450428/normal_602ee0cf17080.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380857/normal_5fe3d6713912b.pdfIn PDF document text
    • https://galesarenad.weebly.com/uploads/1/3/4/3/134380117/zivubagifebovo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498348/normal_60bd042838c85.pdfIn PDF document text
    • https://kasapumaf.weebly.com/uploads/1/3/1/3/131397987/1684490.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470830/normal_5ffcd12ff40c6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c7c118a-7b3a-43f8-811e-1494e18b7e23/do_androids_dream_of_electric_sheep_summary_chapter_9.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4fbb59e-eb66-44bb-bc56-032c5567af5a/baldurs_gate_2_enhanced_edition_best_build.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd6ace8d-ceeb-4012-b6ff-677e50126fc5/what_does_micellar_casein_contain.pdfIn PDF document text
    • http://doxawadar.pbworks.com/f/can_i_get_roblox_studio_on_mobile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1339481a-fd21-4e28-8695-558f6b326948/43375058147.pdfIn PDF document text
    • http://movovepavuzi.pbworks.com/w/file/fetch/144657201/frederick_m_noad_solo_guitar_playing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/704faea2-b0dd-496e-bc6c-0721c5b950e5/21940522579.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_off0000faf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF0 5752 bytes
SHA-256: 5276ac98b27f48357f5f59049bb894bbe7d07a541474de5ad87fccfd0b3df26b
font_01_sfnt_off00010e7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7E 11064 bytes
SHA-256: 46338c369dd9057267a7f54926a78e87f55ec8016a39273822993bf6fe209afd