Malicious PDF — malware analysis report

Static analysis result for SHA-256 79aa8308dca81c1e…

MALICIOUS

PDF

74.0 KB Created: 2021-06-01 12:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b864982bc9c083537905ada868da0db0 SHA-1: 31627072e40d43afe93ce61215cb42d4b1554a3a SHA-256: 79aa8308dca81c1ec22b758592d7a58fb08d6f69552cb0bcdbbe9c3ada61640a
96 Risk Score

Malware Insights

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

The file is a PDF containing an embedded URL that points to a domain associated with phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to a game calculator, which is a common tactic for phishing or directing users to malicious sites.

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://smidgel.ru/pbw?utm_term=game+of+sultans+vanquish+calculator
    • https://static.s123-cdn-static.com/uploads/4420240/normal_5fe284523ed50.pdf
    • https://cdn-cms.f-static.net/uploads/4379732/normal_60299e51364d2.pdf
    • https://cdn-cms.f-static.net/uploads/4425217/normal_60525179db6c8.pdf
    • https://cdn-cms.f-static.net/uploads/4495707/normal_5fd88f519dcaa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/bb72f734-fe6a-46e8-9e71-60cd230faab3/84384724430.pdf
    • https://uploads.strikinglycdn.com/files/cf374b27-34bb-4280-b96e-fe9f5f74030d/fascism_in_italy_world_history_shorts_2_answers.pdf
    • http://zezimin.pbworks.com/f/63382737998.pdf
    • http://paderukut.pbworks.com/f/bruno_mars_zip_vk.pdf
    • https://uploads.strikinglycdn.com/files/0f5ea222-0f3f-46ce-a943-dc3d9bba0e74/lekodexitajawewexitonifi.pdf
    • http://pamotekegopa.pbworks.com/f/35446960709.pdf
    • http://fixunomavow.pbworks.com/w/file/fetch/144449478/wopuxumeturer.pdf
    • https://uploads.strikinglycdn.com/files/5478a1b1-9b11-44d0-83eb-d5e3e4641e86/85400084740.pdf
    • http://niwomif.pbworks.com/w/file/fetch/144428112/12768779876.pdf
    • https://uploads.strikinglycdn.com/files/49fac788-2a05-49e0-b921-329d540c803c/mandalorian_language_this_is_the_way.pdf
    • http://fixiguru.pbworks.com/f/metodologia_de_la_investigacion_bernal.pdf
    • http://kufavuva.pbworks.com/w/file/fetch/144426513/84776467845.pdf
    • https://uploads.strikinglycdn.com/files/d3ae18bc-4a54-47c5-a0f7-ba0f2a69526a/31581609937.pdf
    • http://visetululiv.pbworks.com/f/indirect_object_pronoun_practice_spanish_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/5e22ab66-fbb1-4d7e-a483-f974f3163b4b/zawagadixaluzujozamew.pdf
    • https://uploads.strikinglycdn.com/files/6729a9b2-1843-45fb-970e-8174b41e781a/84903919390.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_off0000e566.bin
ecb5485c5eafe763dddde3ba605a902064ec7eebe61d753fc9d01efedefc6ad8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE566 5340 bytes
font_01_sfnt_off0000f776.bin
f1a3d24a61416b3caee77aea567f9bdd0d8f7744d79dc516e9b7468353c24327
pdf-font-stream PDF embedded font (sfnt) at offset 0xF776 10292 bytes