Malicious PDF — malware analysis report

Static analysis result for SHA-256 56cf9ff0f6f293ab…

MALICIOUS

PDF

76.8 KB Created: 2021-03-18 17:57:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 0faf1d3b1dc1a1b4aaeeeb1e77c83883 SHA-1: 241fb290288046c66dde46dfc6aef3742c79e9ee SHA-256: 56cf9ff0f6f293abd6842d5c4112d0ea0bb336076c3555bbf8591d2de8e890da
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains an embedded URI pointing to 'resalured.ru', which is highly suspicious. The document body, though heavily obfuscated, contains text fragments that, when combined with the URI, suggest a phishing or malware distribution lure related to a 'Trojan horse'. No scripts were extracted, but the presence of an external URI is a primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/award?keyword=caballo+de+troya+9+can%25C3%25A1+pdf PDF link annotation
    • https://cdn.sqhk.co/xurakipigub/gdRiagf/91863855812.pdfIn PDF document text
    • https://cdn.sqhk.co/pinebiven/jf5iixV/touch_the_wall_rule.pdfIn PDF document text
    • http://baranaydin.org/4959048733bstjf.pdfIn PDF document text
    • https://cdn.sqhk.co/sobexofap/1hajbhe/christmas_zoo_piano_tiles_2.pdfIn PDF document text
    • https://cdn.sqhk.co/xewimoziwuvo/dPibZw3/superhero_creator_free_online_marvel.pdfIn PDF document text
    • https://cdn.sqhk.co/boxumiza/hjdiejd/18155449656.pdfIn PDF document text
    • https://cdn.sqhk.co/wadelovelo/lijyIeA/heavy_traffic_racer_speedy_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/wugunifikezu/higgAic/965456109.pdfIn PDF document text
    • https://cdn.sqhk.co/riwifesineji/bTo4tih/8544257225.pdfIn PDF document text
    • https://cdn.sqhk.co/mitugejaxel/sI8jdjb/zozodakujime.pdfIn PDF document text
    • https://cdn.sqhk.co/dalegoti/fgjLBjO/2nd_grade_reading_comprehension_online_activities.pdfIn PDF document text
    • http://leyloften.online/in_pari_materia_meaning_in_law3hdz9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tadevewuju/80977706743.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/bmo_financial_group_email_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eddbbb1c-94d5-4460-a1f5-32b5330e9604/has_voyager_2_left_the_solar_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be228729-3af1-4788-b383-54241f32e940/what_does_woe_mean_in_keto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5756d7f2-87e3-4bb2-9e3e-9c75954b2f9a/sodetoxesuradi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24fcbe9a-703d-45e6-9d21-63b6a2a1988c/introductory_mathematical_analysis_12th_edition_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD16 5368 bytes
SHA-256: 0341ef4b366513fdd541322f3ae6caa7f1babef9cb257739796a5728170f16e0
font_01_sfnt_off0000eee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE4 11964 bytes
SHA-256: 76904b57bd2721c482ae1e50c5e930b913c5f49f840a0874e7c046ec0403327c
font_02_sfnt_off00011611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11611 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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