Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfc2163abb3bba4f…

MALICIOUS

PDF

77.6 KB Created: 2021-03-30 19:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: daa077d9f6cd850ced2c91c80fedf412 SHA-1: b6acd51b25ee6412642b2fa1bec0ba459a7f1421 SHA-256: dfc2163abb3bba4fbb0e2ef8796955f5dacab683ab2b790ab79a8b5973b7eb5b
96 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, 'nipisod.ru', which is likely used to host a malicious payload or redirect to a phishing site. The document body, though heavily obfuscated, suggests a lure related to an essay, aligning with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/strik?utm_term=why+i+wrote+the+yellow+wallpaper+essay
    • http://topmassage.net/44407267512xxq0t.pdf
    • http://ygrash.website/fagaxezipetowozo02us5.pdf
    • https://cdn-cms.f-static.net/uploads/4481825/normal_5fd14b8f8b377.pdf
    • https://cdn-cms.f-static.net/uploads/4416929/normal_600a833edc163.pdf
    • http://republvinb.fun/what_age_can_you_use_fisher_price_jumperookyx9n.pdf
    • http://7lessons.fun/56301303551xzx0t.pdf
    • https://cdn-cms.f-static.net/uploads/4480743/normal_604e93911057a.pdf
    • http://milanomoda-italy.site/38627065413ycrfe.pdf
    • https://cdn-cms.f-static.net/uploads/4369189/normal_5fd68ed0799a4.pdf
    • https://cdn-cms.f-static.net/uploads/4403951/normal_603b5dcc8fa4a.pdf
    • https://static.s123-cdn-static.com/uploads/4413966/normal_5fcd27773c28e.pdf
    • https://cdn-cms.f-static.net/uploads/4457572/normal_604cfee836b8a.pdf
    • http://purpless.vip/pakifinikevafirolifu7cd9e.pdf
    • http://euroshopmn.space/70645761584t0qdr.pdf
    • http://899themes-demo.ru/dead_wallpapers_for_phones_girlya0tfj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/92cb499d-5bd9-4df1-88d5-424003b599b4/el_rinoceronte_libro_resumen_por_capitulos.pdf
    • https://uploads.strikinglycdn.com/files/b30712ec-f833-487b-80ff-3d10f761e09e/what_are_the_different_types_of_nonfiction_genres.pdf
    • https://uploads.strikinglycdn.com/files/c2bc4beb-5c5c-4528-97c5-2c9041a7932b/etymological_dictionary_of_greek_beekes.pdf
    • https://uploads.strikinglycdn.com/files/d8357de4-9c51-4073-af44-f68a48a02315/20177236951.pdf
    • https://uploads.strikinglycdn.com/files/a71128f7-3050-4e60-8347-7b8e3620b02a/what_affects_capital_budgeting_decision.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3a3.bin
3eb847dded2c12bbca4db9341182752565357bd8c2053e54e4d54475f17b9818
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A3 5116 bytes
font_01_sfnt_off0001051d.bin
ef3086c8ed677c74c268ea83618c293c65015147f58508710591a0ee4e5828ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x1051D 10628 bytes