Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca6819f71ddd1f57…

MALICIOUS

PDF

76.6 KB Created: 2021-04-26 11:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 3a59018c8b7dc9da031c8ebf24de907b SHA-1: c83694209bc2a87a98798cbc6d65d90eacd03542 SHA-256: ca6819f71ddd1f57c0c43c4a637149080d6d1c2aeba3c54dfb09d722ea0a52a6
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL leading to 'baarspo.ru' and containing a lure related to an English course. The document body, though heavily obfuscated, suggests a similar lure. The presence of multiple disposable hosting links further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/strik?utm_term=curso+de+ingles+basico+para+principiantes+teacher+bocarando PDF link annotation
    • http://kvyovk.xyz/beden_kitle_indeksi_nasl_hesaplanr_formlbp65o.pdfIn PDF document text
    • http://sodaapp.club/5968767639979yla.pdfIn PDF document text
    • http://shopyou.online/vuxagirefasony4vte.pdfIn PDF document text
    • http://imkl-checker.com/tudavibokaefm4o.pdfIn PDF document text
    • https://cdn.sqhk.co/pulazapusaw/OXhbW4b/pajojawevadabur.pdfIn PDF document text
    • http://mini-cam-v2.club/dodulesijavulvumvi.pdfIn PDF document text
    • http://trendmobile.ru/define_distress_in_abnormal_psychologyxi4fw.pdfIn PDF document text
    • https://cdn.sqhk.co/fimirexuf/jgPjgAu/hallmark_tv_series_2019.pdfIn PDF document text
    • http://creamwalls.space/delopegagokenokibaridiwox68dxw.pdfIn PDF document text
    • https://cdn.sqhk.co/xakelafu/jllhgie/nupinugasatoke.pdfIn PDF document text
    • https://cdn.sqhk.co/ximepadogi/fTxghhf/switch_pro_controller_charger.pdfIn PDF document text
    • http://prostochillforum.fun/pokemon_cafe_mix_charactersb62eg.pdfIn PDF document text
    • https://cdn.sqhk.co/dibitarebizu/sgijfia/daxumidufod.pdfIn PDF document text
    • https://cdn.sqhk.co/fowujizul/fjhgeDL/surf_fishing_report_destin_fl.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/feb0110e-4c94-43d1-b484-6b04d68366ce/sony_dav-dz170_5.1_channel_dvd_home_theater_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98a5092c-6fd3-4224-a090-9a84b634c284/how_to_open_sharp_microwave_drawer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62f9b587-fae8-4b13-985f-69e1d68743a3/recursive_methods_in_economic_dynamics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f410007d-06ca-4f60-929d-bce21b9aed4c/gejekof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c4da366-8a47-48e8-a886-8b80fd672ee0/horde_pvp_vendor_pandaria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0a23ff8-0d4a-488f-a121-562680cd9176/xanathars_guide_to_everything_spell_scrolls.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4e8062e-d6f5-41e3-ac40-b8b8dc4d20b7/what_to_do_if_washing_machine_is_not_draining.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_off0000ea96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA96 5380 bytes
SHA-256: 8501b629e0c827d677281379a95321bff9cf435056a2c0ccf970fde2b5525a40
font_01_sfnt_off0000fccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCF 11916 bytes
SHA-256: 2c9e419717727d23e9ab959f7ee44fb6e77e90a9093ff5c540922f920d53a481

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