Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b83b0266b73db37…

MALICIOUS

PDF

78.7 KB Created: 2021-04-09 17:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 579af96a54706e6de25e1d2d9f4444f3 SHA-1: 7341127c136d9aeab4cf7ac28b819a57c49bf54c SHA-256: 4b83b0266b73db370035bd566e2536e4d472029b18636a1198b26ec1f423ea4f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used for SEO spam or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 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.
  • 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://fokemale.ru/strik?utm_term=best+skyrim+quest+mods+xbox+one+2020 PDF link annotation
    • https://dajoromu.weebly.com/uploads/1/3/4/3/134309711/34c39559aa651f0.pdfIn PDF document text
    • http://allerlo.xyz/luwojevej4d4.pdfIn PDF document text
    • https://vasigigu.weebly.com/uploads/1/3/4/6/134607878/momefitakujabirapet.pdfIn PDF document text
    • https://bikugepoxo.weebly.com/uploads/1/3/5/3/135351236/472d784147.pdfIn PDF document text
    • https://lusogovo.weebly.com/uploads/1/3/4/3/134358567/soxezenomezesipede.pdfIn PDF document text
    • http://netlysy.online/fallout_4_map_size_vs_gta_5voj1q.pdfIn PDF document text
    • https://texifafotolatip.weebly.com/uploads/1/3/4/7/134764930/b6c57d34c6db4e3.pdfIn PDF document text
    • https://bigimenuxorotel.weebly.com/uploads/1/3/4/6/134655509/282caea.pdfIn PDF document text
    • http://2020coupons.info/math_magic_workbook_class_4k6thx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2a984544-7cb8-4a4d-9f60-e686f7994e39.filesusr.com/ugd/1434d3_ef480c1d29774c5f8f544a3a7c8dcd5a.pdf?index=trueIn PDF document text
    • https://7fad2989-91b8-457c-89bc-9a0e7aeef19f.filesusr.com/ugd/b03ff3_ca0e23d326cc407490dc8c00b8a00712.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gulapore/best_free_audio_recording_software_windows.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/how_to_set_up_jitterbug_smart2.pdfIn PDF document text
    • https://86908e24-11f3-43a1-9346-bf531f45ee0b.filesusr.com/ugd/97493d_6f156c589a89445c8b2808936aee5b61.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/satedafadusizo/liverpool_vs_real_madrid_team_sheet_2018.pdfIn PDF document text
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_2400eba02fd94a6daa7d53561b3094a2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/demonstrative_adjectives_exercises_with_answers.pdfIn PDF document text
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_babaedc058224982b07b4dda53fc858f.pdf?index=trueIn PDF document text
    • https://30cc9e9c-6145-4029-bfdc-d0561bdb3a10.filesusr.com/ugd/0dcf4b_a128ade9c7fa4be68b0c63aa63336dc8.pdf?index=trueIn PDF document text
    • https://f867c6cd-7aae-4938-a634-6821dcb48262.filesusr.com/ugd/eb45fa_9d3b3fd08f4f4f47806959f662e67e89.pdf?index=trueIn PDF document text
    • https://a54de82d-0003-4787-801b-d7ee719c780a.filesusr.com/ugd/8d57bd_e5339930b8b54b0d9c806a9d59621286.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/18015355460.pdfIn PDF document text
    • https://ce83042b-5faf-46b5-bcbb-9b4d05ec7d33.filesusr.com/ugd/a31856_9576c52a75514869a2c0be3fe12cbee0.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f63a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63A 5552 bytes
SHA-256: 939a8eb1aeaaf3697e775c138f0fc395fbdead0c0987394fa1b4fcdcca29f999
font_01_sfnt_off00010917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10917 10716 bytes
SHA-256: 59eff5219db31552d5b7801de838af305a740ea006d7870dab3f83850f20c8af

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