Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8295b65a12fa872…

MALICIOUS

PDF

77.9 KB Created: 2021-03-19 08:53:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6c0f2489c7fd6314cc1712fe81756b82 SHA-1: 59aefd2acbe5ce5f81efe744e0c56fc60484214b SHA-256: f8295b65a12fa872ee9ea8e7c69d426032b7c28444df9acf693a57bafca2afac
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 0.9992

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://dugedepap.ru/strik?utm_term=how+should+mother+of+the+groom+dress PDF link annotation
    • https://cdn.sqhk.co/fegadosijete/0Z4jaia/renefifuju.pdfIn PDF document text
    • https://luzatewuxajexi.weebly.com/uploads/1/3/4/2/134265782/senedaguvo_pobevadodolafu_sumuzelejaraf.pdfIn PDF document text
    • https://cdn.sqhk.co/zopizote/ib3VhcZ/saresitakonisizosebuz.pdfIn PDF document text
    • https://tokubarip.weebly.com/uploads/1/3/1/3/131380438/muxibiluwimu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415526/normal_5fe82c9569700.pdfIn PDF document text
    • https://katabeguravaka.weebly.com/uploads/1/3/1/4/131407194/f8d6677c.pdfIn PDF document text
    • https://vomerigovelaj.weebly.com/uploads/1/3/4/9/134901888/94cd410d5c7.pdfIn PDF document text
    • https://cdn.sqhk.co/zumufapofow/usxijms/empire_warriors_tower_defense_td_strategy_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/batovafakupo/fBbpjja/angry_birds_epic_for_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/xawobovuji/ggf4ijw/guide_for_voot_tv_show_live.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454290/normal_5fffa10c8a395.pdfIn PDF document text
    • https://cdn.sqhk.co/vekasurox/BjhKjdU/stress_management_tips_for_working_moms.pdfIn PDF document text
    • https://cdn.sqhk.co/vedimurami/mghhb8v/wind_rider_video_games.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389127/normal_5fef7b4819d8f.pdfIn PDF document text
    • https://cdn.sqhk.co/sorubajuzoxe/UVpjbgf/72598835116.pdfIn PDF document text
    • https://xemegejimeje.weebly.com/uploads/1/3/1/6/131636808/476919.pdfIn PDF document text
    • https://cdn.sqhk.co/mijajijem/Wmzhbha/vatonaxiv.pdfIn PDF document text
    • https://bobefadapuxat.weebly.com/uploads/1/3/4/8/134858353/88f90eaf401a6b4.pdfIn PDF document text
    • https://subilitukufune.weebly.com/uploads/1/3/4/6/134629352/9588698.pdfIn PDF document text
    • https://vifixizunegivu.weebly.com/uploads/1/3/4/3/134349865/3963206.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/22b5de27-6fcf-426a-adf3-7930460e8f90/dusononidetomasazexukizeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2063028f-ea48-4ada-a8d8-45a1d2e2d794/how_to_reset_ellipsis_7_tablet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38215340-eac8-45c1-8213-315acd25c5f0/cambridge_professional_english_-_business_vocabulary_in_use.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_off0000f46f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46F 5164 bytes
SHA-256: 1e02bb59bd4ee4284e6059ccf63e9ead2f8233ed58d2a577954c9498fee76389
font_01_sfnt_off000105e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E5 10596 bytes
SHA-256: 7c38806a87322994cae4c44dd36a37d9e45d2a1a1a26eccc4d111aecea980f7a