Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a613e650cbeea18…

MALICIOUS

PDF

74.5 KB Created: 2021-04-13 07:41:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 53b18f79b22f75e09fdd8f27c8dd7f30 SHA-1: d04b9f49627b420e61b334099a849010ba80ccb8 SHA-256: 2a613e650cbeea181cd9a4154897bdceb61ce8e5853c34a278e12824f9e7b4fb
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a Trojan. The embedded URLs suggest a lure to download further malicious content or engage in phishing.

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://zajinet.ru/strik?utm_term=4th+grade+go+math+assessment+test+printable PDF link annotation
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://limons.space/how_to_earn_brownie_my_best_self_badge9tteb.pdfIn PDF document text
    • http://igrarazuma.info/pokemon_insurgence_gba_rom_hack_downobpsx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390374/normal_5fe33681decd2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387581/normal_6006ae9e6cf4f.pdfIn PDF document text
    • http://glossywp.online/suvufewogumolibuko149zz.pdfIn PDF document text
    • http://carbackseat.site/how_to_write_a_nursing_diagnosis_for_constipation6i9ny.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369781/normal_6035103b22045.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/tobito/nobexawuwepawuxetojodu.pdfIn PDF document text
    • https://s3.amazonaws.com/fadobirak/gossen_luna_pro_sbc_repair.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56bb14f0-e073-435e-843f-6666af5d03c0/89684996540.pdfIn PDF document text
    • https://s3.amazonaws.com/woxotopapozokev/abranet_sanding_sheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c1ecfb5-39b8-49b6-bceb-fa8075184591/mavelili.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff99a83f-1016-47f0-b218-b7abc215e01f/feliz_navidad_jose_feliciano_blind.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59706c46-7053-478e-be1a-c4adbd74a0b8/cannot_open_printer_properties_windows_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f1c9bf2-2238-412d-a68d-c4934b5630f5/what_is_the_evidence_of_the_holy_spirit_in_the_bible.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d85e8c18-c140-4cd7-bdef-25b073602571/49117714900.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f435544c-a2fa-4ded-909d-a7d757276d28/what_does_what_is_your_philosophy_in_life_mean.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/76953369675.pdfIn PDF document text
    • https://s3.amazonaws.com/zisulamisozoto/79718778065.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_off0000e537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE537 5508 bytes
SHA-256: 075b0ae8a91d4da9c5bddf406a70dd929f36df0afbc62bcb14dfb084f2071c81
font_01_sfnt_off0000f7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BE 10840 bytes
SHA-256: 67c266280fe7a76a372473804dfd26b0cf3a29cbf5936a5180ebf00574df3ca6

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