Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc996c83cfeafb8…

MALICIOUS

PDF

78.0 KB Created: 2021-05-11 04:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 79ab4ef83c9a64bde3dcf4285e3a3277 SHA-1: ef70e1b52a377fd4513988b360990719405daa5d SHA-256: cfc996c83cfeafb81337c6571c105a540d97b1bc9a37bdda9e60e8c0ff6b850b
156 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 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 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://zajinet.ru/strik?utm_term=casio+lk-100+price+australia PDF link annotation
    • https://pamaxorakumi.weebly.com/uploads/1/3/4/0/134019068/guduwupojudavijid.pdfIn PDF document text
    • https://cdn.sqhk.co/vofudejobif/KDjgfhh/gem_heroes_game.pdfIn PDF document text
    • https://cdn.sqhk.co/vabedesi/g6ie9ih/piano_keyboard_online_price.pdfIn PDF document text
    • https://cdn.sqhk.co/nefakovuwot/jd7ifpB/51897445173.pdfIn PDF document text
    • https://jorokepevi.weebly.com/uploads/1/3/4/6/134688072/3475292.pdfIn PDF document text
    • http://jibuwuxopi.22web.org/goggle_lens_color_guide_motocross.pdfIn PDF document text
    • https://cdn.sqhk.co/mosepoxik/hjPhfih/redstone_house_map_for_minecraft_pocket_edition.pdfIn PDF document text
    • http://miwezewavokalar.iblogger.org/algorithms_dasgupta_solutions_manual_github.pdfIn PDF document text
    • https://cdn.sqhk.co/xoraxuvonaf/hss2W32/37611872355.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bupijila/49676259934.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/suwoz.pdfIn PDF document text
    • http://ziboporo.epizy.com/food_allergy_treatment_guidelines.pdfIn PDF document text
    • http://fapubogodomeduj.epizy.com/87797795616.pdfIn PDF document text
    • http://teguwawax.rf.gd/zanej.pdfIn PDF document text
    • https://s3.amazonaws.com/sewamos/halloween_dance_flyer_templates_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/endoscopy_normal_report_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/cbse_guide_for_class_10_science_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/medicaid_eligibility_michigan_assets.pdfIn PDF document text
    • http://gexujik.epizy.com/icao_annex_10_volume_5.pdfIn PDF document text
    • http://nazopagoja.epizy.com/benefits_of_computerized_accounting_information_systems.pdfIn PDF document text
    • http://kedogevakubonog.epizy.com/free_listening_comprehension_worksheets_for_kindergarten.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/fegazexubo.pdfIn PDF document text
    • https://s3.amazonaws.com/juvosi/cartoon_slam_font_free.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/ririkonafumojo.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_off0000f2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B9 5120 bytes
SHA-256: 1c09ecb31797a282e320cb8183732ca2ae31064516ffba823e46007f16a27f1c
font_01_sfnt_off0001043b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043B 11376 bytes
SHA-256: 6df7e39115dd238f176fdbad795cfd53daae561ab9fa2437923319cc55ce4ae7

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