Malicious PDF — malware analysis report

Static analysis result for SHA-256 6db570aa7e3095a2…

MALICIOUS

PDF

73.5 KB Created: 2021-03-24 04:35:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 759b676817483e31bcce7721bafe4ee2 SHA-1: 2a6ed654326719c5b9d44fc52180774100173aa0 SHA-256: 6db570aa7e3095a2845c8b5771d5d793413b6ed0d480c7e693f13e463f1534bf
156 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which are likely part of a link farm designed to direct users to malicious websites. The primary malicious URL identified is https://pelibifir.ru/strik. The presence of numerous PDF_SEO_LINK_FARM heuristics and a high ML classifier score strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • 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://pelibifir.ru/strik?utm_term=sheriff+of+nottingham+board+game+for+sale
    • https://cdn.sqhk.co/fedelubu/gcjhigE/ninja_arashi_mod_apk_unlimited_life.pdf
    • https://cdn.sqhk.co/dederubap/jYXxjbB/pixel_art_live_wallpaper_android.pdf
    • https://cdn-cms.f-static.net/uploads/4445877/normal_6030958c9b0c7.pdf
    • https://cdn.sqhk.co/runenuti/bWicIhc/sas_zombie_assault_4_apk_mod.pdf
    • https://cdn-cms.f-static.net/uploads/4453747/normal_6038543f9d25f.pdf
    • https://static.s123-cdn-static.com/uploads/4483864/normal_6005d33168f3d.pdf
    • https://cdn-cms.f-static.net/uploads/4366366/normal_6014b035b16e6.pdf
    • https://cdn.sqhk.co/bulunazi/giqNghD/la_times_crossword_puzzles_mensa.pdf
    • https://cdn-cms.f-static.net/uploads/4448976/normal_605a7f20acc2f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wujodibu/bollywood_hd_movies_free_mkv.pdf
    • https://065b66ee-25d8-4381-b309-094abc4d823c.filesusr.com/ugd/2703e6_9147e4268e9d4ab7a04cd650b35ba41e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/10b4b2c1-934c-46bb-a96a-b00d55ab8c6a/milulenorufubefiwojusamam.pdf
    • https://uploads.strikinglycdn.com/files/f2753128-0edd-48a2-afe2-d922425bdc73/67905154904.pdf
    • https://uploads.strikinglycdn.com/files/83786847-b424-42d8-b383-9aa9de3f0575/fetisetevof.pdf
    • https://24218389-b518-4ca3-8548-65eaf758daa4.filesusr.com/ugd/c836c3_27e0ee8c4d52477cba0799cae82ef7fd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fc66be52-1337-4ded-b5d9-e914480c9468/tyrolia_sl45_bindings_manual.pdf
    • https://s3.amazonaws.com/xupizewuxere/delete_a_sheet_in_excel_using_vba.pdf
    • https://uploads.strikinglycdn.com/files/42a7fe5d-43f5-48fa-bbb7-25ed1acf6650/xuxiwa.pdf
    • https://uploads.strikinglycdn.com/files/af0ee603-41de-40a7-9d6c-177924a296a5/trig_function_values_table.pdf
    • https://uploads.strikinglycdn.com/files/bc8da4cb-2773-4c74-b06f-efd342891369/zesekafozoradirewibosul.pdf
    • https://uploads.strikinglycdn.com/files/61b9b99c-4f7e-4718-83b9-3590aa7eecdb/mebirifi.pdf
    • https://uploads.strikinglycdn.com/files/6965c79f-9ae1-4ed8-a67f-f352bda333c0/zasopitipapidugodefep.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_off0000e013.bin
37c20e7f1d62fbac1e6a15790421bdca9776a8c70f43ccffb1feaac97b646da7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE013 5564 bytes
font_01_sfnt_off0000f2c9.bin
5fbb22002fb7c0c5f253d21aeeb4079bb3c8b1122f56a3623b3b115b6f0248e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C9 10940 bytes

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