Malicious PDF — malware analysis report

Static analysis result for SHA-256 033fd91ed18822d5…

MALICIOUS

PDF

81.4 KB Created: 2021-04-15 21:16:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4dd0445909c641dae255e209f4de17d8 SHA-1: d43d95f1249a65a58d599023122951c921da53b4 SHA-256: 033fd91ed18822d5a50fe03afeee45522d8ec96a0151e838885400ef43aa6d7c
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier. It contains an embedded URI pointing to 'https://kuzutuzo.ru/strik?utm_term=how+to+use+a+copper+moonshine+still', which is likely a phishing or malware distribution site. The document body, though heavily obfuscated, suggests a lure related to moonshine stills, indicating a social engineering tactic to entice users to click the malicious link. No scripts were extracted, but the presence of external URIs and the overall malicious verdict strongly suggest a phishing or malware delivery attempt.

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://kuzutuzo.ru/strik?utm_term=how+to+use+a+copper+moonshine+still
    • http://siwupojotuj.getenjoyment.net/62667762557.pdf
    • http://crystal-light33.ru/what_are_some_good_deep_conversation_topicsmiyrs.pdf
    • https://cdn-cms.f-static.net/uploads/4448110/normal_6031dfa5e189d.pdf
    • http://istra-backwater.ru/5631097089509g6h.pdf
    • http://jajuviramigawo.medianewsonline.com/vetozaxuneturuvowuratofe.pdf
    • http://vk-settings-change.online/horus_heresy_siege_of_terra_book_3zxvwj.pdf
    • https://static.s123-cdn-static.com/uploads/4484376/normal_60069b3452684.pdf
    • http://chestlune.online/96227812627vs0bs.pdf
    • https://cdn-cms.f-static.net/uploads/4458849/normal_60542dfe60ae0.pdf
    • https://cdn-cms.f-static.net/uploads/4461511/normal_606569e4e7491.pdf
    • http://ninomut.sportsontheweb.net/why_does_my_lg_tv_screen_keep_flashing.pdf
    • https://cdn-cms.f-static.net/uploads/4384831/normal_605d912b85737.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://xologikaju.atwebpages.com/what_is_the_theory_of_universal_gravitation.pdf
    • https://7f1888b6-cdab-4603-9914-1cf81a8b29aa.filesusr.com/ugd/6846fe_a48437cd8e224689b2b11edff483b9f9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cdfd91df-d837-456b-a23f-3db638178438/does_ps3_controller_work_on_ps4_reddit.pdf
    • https://uploads.strikinglycdn.com/files/03367c98-b3c9-448d-bd8a-35811218cb1f/39642085345.pdf
    • https://7162f0c1-3bb2-4775-9ad2-1e34613fb889.filesusr.com/ugd/595093_4c987a05b1ba47ddba82886d110561dd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/291a8a67-7e72-4116-9dc6-6072d3b82eb4/analisis_desde_el_jardin_jerzy_kosinski.pdf
    • https://uploads.strikinglycdn.com/files/bf07bf8d-e5f8-4e81-baa5-15297f6aedc8/kinobody_diet_example.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2c5.bin
6ad9eba138f54f36f5db1364e04eb5607735a18d01bbbe802b6b55656441deb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C5 5108 bytes
font_01_sfnt_off000103fc.bin
8e7d3cb6621b9cbf13e95465618868f8c875166c81be46db72d77777da7b29e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103FC 11448 bytes
font_02_sfnt_off00012a55.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A55 4324 bytes

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