Malicious PDF — malware analysis report

Static analysis result for SHA-256 76f3cf5759c6f5b1…

MALICIOUS

PDF

79.5 KB Created: 2021-04-04 14:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 58544a253a35a995e9b09056f907c100 SHA-1: d2cb6f510ebb996c097c881db5c5b4df0caaaae9 SHA-256: 76f3cf5759c6f5b1b96b40c32bef2b6ed705325fc8ee6c6c54b64fc71a0e43fb
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains an embedded URL pointing to a suspicious domain, likely intended to trick the user into clicking it for information. The document body, though heavily obfuscated, suggests a lure related to sports risk measurement.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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+is+risk+measured+in+sport
    • https://static.s123-cdn-static.com/uploads/4467017/normal_5fec9653ccb86.pdf
    • http://samyog.ru/la_biblia_continua_serie_completa_espaol_latinobob90.pdf
    • http://bitsracing.net/what_is_the_meaning_of_strip_croppingrhfmx.pdf
    • http://parhelifrl.space/besaxujegodulifudutukatirxfp5.pdf
    • http://cooldomen.space/sony_playstation_vita_2019dw441.pdf
    • http://scarcebook.com/tevomukakolixejotidemthqrz.pdf
    • http://sollabs.xyz/54975162060ocle0.pdf
    • https://cdn-cms.f-static.net/uploads/4369640/normal_6060de97edb5c.pdf
    • https://static.s123-cdn-static.com/uploads/4419204/normal_6005b4c96ec14.pdf
    • https://cdn-cms.f-static.net/uploads/4498997/normal_601d244748afc.pdf
    • http://samo-katim.ru/40924124936wucdz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://2efabd41-1f95-43d0-8245-5f8eb9267247.filesusr.com/ugd/2f4ddf_ae21c48d440e4eed90fa335abeaab7e3.pdf?index=true
    • https://s3.amazonaws.com/lorerexeg/49647736438.pdf
    • https://s3.amazonaws.com/joterige/wifar.pdf
    • https://5057b38b-f250-4925-a5fd-2dbc054a2c1f.filesusr.com/ugd/25ee37_b7401daa7fbd43a48a468a419059fdd7.pdf?index=true
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_6f34755ebd644bff8b2b3c6db94538fa.pdf?index=true
    • https://s3.amazonaws.com/fajetufekejo/free_online_electrical_engineering_courses_uk.pdf
    • https://s3.amazonaws.com/dowavelaxam/what_color_is_my_period_blood_supposed_to_be.pdf
    • https://s3.amazonaws.com/janodojivi/shark_portable_steam_cleaner_sc505.pdf
    • https://41d9b059-0b17-466b-96e6-f31a3f3e9b19.filesusr.com/ugd/f1ead9_75983a9aa9a943d9bd34d7a349f6538e.pdf?index=true
    • https://769966b8-4adc-437e-bba8-f198cf6e171b.filesusr.com/ugd/41a0b6_c5d8e446954840178a2a9353ab3e60f2.pdf?index=true
    • https://d6a293f2-6876-493d-91b7-c13182b05023.filesusr.com/ugd/bcaa7e_c1460bcfc2ce423f9a249055bc091553.pdf?index=true
    • 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_off0000ebaa.bin
2acf565687daeb06a4345c1f43369045766804af703478e80ad3d50079afa861		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAA 5072 bytes
font_01_sfnt_off0000fcd7.bin
33e5d307fc9a3a44fed467d03f7933438ee3ca7b5839dc8e6ad370b134e92cce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD7 11156 bytes
font_02_sfnt_off000122b8.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122B8 4324 bytes

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