Malicious PDF — malware analysis report

Static analysis result for SHA-256 58ca70b1322fe696…

MALICIOUS

PDF

76.4 KB Created: 2021-04-04 16:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6c86faef3f374251239f52f016afcc6a SHA-1: 30e8324b43a295399a38fe373d370138e0af79ad SHA-256: 58ca70b1322fe696d6ac417062bfb9ee28c2c242ab106cd7e6bac151751e3149
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 0.9991

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://pelibifir.ru/award?keyword=planos+aviones+de+papel+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412773/normal_5fe94a3662b9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411686/normal_60465ad47a775.pdfIn PDF document text
    • https://cdn.sqhk.co/matezafun/niF7bF2/14243488465.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423166/normal_6010d533ad39c.pdfIn PDF document text
    • https://cdn.sqhk.co/sejejajoxej/gctdjiT/jokalerexiseze.pdfIn PDF document text
    • https://cdn.sqhk.co/lebexuzo/jfih2hh/gatakivogepevezewone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481411/normal_60451de7aa5e7.pdfIn PDF document text
    • https://cdn.sqhk.co/pasojixaju/Biaiehi/76992781479.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460706/normal_5fd7f53f3c449.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/2efce10b-ce51-48cf-b96d-cd16b7473f7c/craftsman_27cc_weed_wacker_carburetor_adjustment.pdfIn PDF document text
    • https://83bd47e3-138d-48d8-8d00-514fe13b91b0.filesusr.com/ugd/c87a2f_b0a7d713b1234dfca740a55ef7ae71a3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8f79a01-4533-4a18-9732-f4ceea8b36ca/narrative_writing_prompts_for_high_school_students.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87fafb99-e9ad-4bd0-907d-578ce6473157/one_punch_man_season_2_english_dub_netflix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1cb74b6-3d4d-4fd9-8be5-0e66fbc75723/retezatolamewedutezesifev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f97cca68-dfa7-4dd4-974f-cdae47b4982b/download_autocad_mechanical_student_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0abd8b3c-a241-42cb-8d10-a2421aa878b6/gefojinut.pdfIn PDF document text
    • https://ce2645ba-e89a-43d5-afff-5c0150757291.filesusr.com/ugd/c63dba_363951a6d0cf4b79ada352179a6945ec.pdf?index=trueIn PDF document text
    • https://557345b1-98c6-442d-b460-9e357c178e5b.filesusr.com/ugd/dfb5f8_d0f59616778e441f940f51213f96c364.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/24a52f67-1e44-4d39-b8f9-858063803dd0/why_is_my_ac_not_cooling_properly.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/158f5b72-2990-4051-b6a3-d79c75d95fd3/riwida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fda30f61-318d-480b-b5d5-068d0918e6a5/84878170267.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a841a3c3-76d1-4c81-9f61-d999eb2144fd/6738711710.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6829fbe8-c2b4-4ebe-b957-46569dc62a1c/why_is_colour_important_in_graphic_design.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/061b65fc-e76b-487e-83d5-c83da8a2388a/my_little_chickadee_song_lyrics.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_off0000ecb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB2 5000 bytes
SHA-256: abae88f155154955bb774944307eb58e4ee0c458657ec6615e350d76388b24a6
font_01_sfnt_off0000fdd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD1 11304 bytes
SHA-256: a0009b8efb6d8826db7f36e484a5ef89a62d4d65f3747f4f7555f57c5a7444f6