Malicious PDF — malware analysis report

Static analysis result for SHA-256 def00c7bdbb571b4…

MALICIOUS

PDF

77.5 KB Created: 2021-03-12 18:23:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c85db44dec5951dff1e9c120fd87a22c SHA-1: 179242949196b19238e0746fe0d7fe2831a504b0 SHA-256: def00c7bdbb571b4835169f5909b0b2aa0b3d3e6122c9b06e48380b705c7b12f
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 0.9948

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://bologen.ru/award?keyword=biology+grade+11+12+textbook+pdf PDF link annotation
    • https://sojetupeduxagi.weebly.com/uploads/1/3/1/8/131856567/9668363.pdfIn PDF document text
    • http://tinubawolu.mywebcommunity.org/statistical_inference_for_engineers_and_data_scientists.pdfIn PDF document text
    • https://cdn.sqhk.co/bemovunilupo/Jjcgdib/comprar_super_recarga_claro_honduras.pdfIn PDF document text
    • https://nufapapezo.weebly.com/uploads/1/3/0/9/130969462/8740161.pdfIn PDF document text
    • https://cdn.sqhk.co/visukodo/SJJAhcu/horror_movies_imdb_list_2019.pdfIn PDF document text
    • http://gejulavofanutar.mygamesonline.org/xaxaxesopaxozowoxodo.pdfIn PDF document text
    • http://xivazokib.medianewsonline.com/is_there_a_one_of_us_is_lying_movie.pdfIn PDF document text
    • http://kamefutebiwef.mywebcommunity.org/asu_polytechnic_parking_map.pdfIn PDF document text
    • https://niraniki.weebly.com/uploads/1/3/4/6/134662237/7282427.pdfIn PDF document text
    • http://wulutano.mywebcommunity.org/how_to_winterize_a_simpson_power_washer.pdfIn PDF document text
    • https://cdn.sqhk.co/wuwoxegolewa/RibJwkq/seasons_of_war_derek_landy_release_date.pdfIn PDF document text
    • http://lumogodasekepi.mypressonline.com/81112258173.pdfIn PDF document text
    • https://cdn.sqhk.co/mekerijiwuv/bl7qUgi/break_bricks_with_hand_record.pdfIn PDF document text
    • https://cdn.sqhk.co/javomekoru/FgiBHhh/milesenevujemozewurogu.pdfIn PDF document text
    • https://tupokigefadewun.weebly.com/uploads/1/3/4/7/134702618/dexaxixose.pdfIn PDF document text
    • https://teditiwos.weebly.com/uploads/1/3/2/6/132681477/nokijokofigevi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://fb075467-9d00-46c6-93ac-2b777f5e584b.filesusr.com/ugd/8bcd66_6c7a4e35ad044766b837ac273d7db029.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c91502b-7cb2-4542-9eda-bbfa5f65495a/what_size_tires_on_a_2017_chevy_equinox.pdfIn PDF document text
    • https://810dce77-56ab-4324-823a-3549757f4eab.filesusr.com/ugd/1fad07_841f0bd249ca444e968f157127917871.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f7abdc3-71e2-4f18-a307-daf7ba5503e2/43125645048.pdfIn PDF document text
    • http://ziwemasux.myartsonline.com/77913509807.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ad6294e-1223-47be-974f-024772b88483/95072358504.pdfIn PDF document text
    • https://fecd0c08-032d-4b8b-b26c-6108aca7a00f.filesusr.com/ugd/a87c8b_003af479d74a4a34aa84ff0c87012f01.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/76539418-8e58-4991-9c61-0b3bb917b983/55487503331.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9334d9ba-d08a-4ee6-b2a5-7ba9b581a8a3/24155775489.pdfIn PDF document text
    • https://dda5c79a-a75d-44d9-a006-48dec3bfe172.filesusr.com/ugd/115d6e_3af868411bb5448e93f8d0744fbb3bcd.pdf?index=trueIn PDF document text
    • https://254a6a59-343e-4b7e-907c-c4819e171fff.filesusr.com/ugd/decf6f_c3bb583032fa441d8f53185ee198f19b.pdf?index=trueIn 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_off0000e401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE401 5320 bytes
SHA-256: e190a58d1e3dfa9483000c805a617e2e0c5c243023dee9cc34fe11e43e6b4425
font_01_sfnt_off0000f63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63C 10460 bytes
SHA-256: 59bb790731476286b9e4ccb59ebce6d80064ae6f1442c14d2ccd2e0a43736d12
font_02_sfnt_off00011a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A04 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378