Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbde8a1de3e49161…

MALICIOUS

PDF

74.9 KB Created: 2021-04-02 13:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1a350ab50c3c527d0ccc0274d44f8294 SHA-1: 969a4a340eb832ab7cfa80aa06b9c04de3746931 SHA-256: bbde8a1de3e491618a87b6484c8f6f906b229b7e4c9517f9c1b0c8522395e0f7
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 0.9990

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://kuzutuzo.ru/award?keyword=radiation+heat+transfer+nptel+pdf PDF link annotation
    • http://fiwupejebibogu.sportsontheweb.net/cartagena_colombia_map.pdfIn PDF document text
    • http://pekibimige.mygamesonline.org/capricho_definicion.pdfIn PDF document text
    • https://cdn.sqhk.co/reposivekow/gihgfFM/best_samsung_galaxy_s7_ringtones.pdfIn PDF document text
    • http://takipibimaxubov.sportsontheweb.net/jiwenawisafe.pdfIn PDF document text
    • http://kunozoxutokusu.mygamesonline.org/marvel_what_if_trailer_release_date.pdfIn PDF document text
    • http://sozimaxetupow.mywebcommunity.org/tomitik.pdfIn PDF document text
    • https://cdn.sqhk.co/fasotaluvose/ejhjdAn/99032089306.pdfIn PDF document text
    • http://kolagozisil.mywebcommunity.org/61144330470.pdfIn PDF document text
    • http://nidikasuzarola.iblogger.org/how_many_miles_will_a_cummins_5.9_last.pdfIn PDF document text
    • https://cdn.sqhk.co/bisuligiga/cjiWibC/8860564424.pdfIn PDF document text
    • https://cdn.sqhk.co/romilononove/zKOXXhf/59286243832.pdfIn PDF document text
    • http://sidufapas.mywebcommunity.org/vuzuxidarofagujewirisis.pdfIn PDF document text
    • http://fumizudo.sportsontheweb.net/2020_ashrae_fundamentals_handbook_si.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://da9d63b4-fbfd-4f6f-88e7-06ac0d76355b.filesusr.com/ugd/ca300b_a03b72612a864272b0bec397b14174d6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b0c1bec-be27-4632-a2a8-3537a8350f59/ferijagumiputaruze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e739738-6ede-4fec-b266-373d45ce497a/the_passionate_shepherd_to_his_love_analysis_sparknotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d2b8cfc-502b-48f7-9c55-8c99c1ec95e5/4673144571.pdfIn PDF document text
    • http://temomuduzuba.epizy.com/24815401297.pdfIn PDF document text
    • http://wutagokavejeve.rf.gd/12124151859.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbf93664-4ea0-442b-9c9b-fe0cc53fc8c8/43013673063.pdfIn PDF document text
    • http://rivenoke.onlinewebshop.net/they_poured_fire_on_us_from_the_sky_quotes_with_page_numbers.pdfIn PDF document text
    • https://528f6e5c-6927-42ef-b7a5-a8f9c349750c.filesusr.com/ugd/07b979_43beac3089834891940c3349d4c7378e.pdf?index=trueIn PDF document text
    • https://a1f0096d-76f5-425c-b826-5ccbd312c1bc.filesusr.com/ugd/8f8c07_9b3cc337dfca42ac87d0a8ef66cc00a6.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_off0000db04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB04 4924 bytes
SHA-256: 6511385d406e7421afe83131a6274b90489ab6b67ff58a91b48a31c275b55f32
font_01_sfnt_off0000ebb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB5 10456 bytes
SHA-256: da126085e12a85d24d4692e7c5969edf8176f1d2b5a7a9fdabfdd58a253d6098
font_02_sfnt_off00010f81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F81 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c