Malicious PDF — malware analysis report

Static analysis result for SHA-256 a608d1dbae0937c8…

MALICIOUS

PDF

77.5 KB Created: 2021-03-22 19:26:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b2c81b84aa501c8ca9d9abbaefd7c1a SHA-1: 9907b12bc703a408fb8976b5bf5e1092ca9f5837 SHA-256: a608d1dbae0937c8d90b350dc81435254074e4ced8e55b618ec5016477474657
96 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating the presence of external URIs and embedded URLs. The document body, though heavily obfuscated, contains strings that appear to be product names and application details, suggesting a lure. The primary malicious URL, https://mezovuduw.ru/wix?keyword=subdecay+f-bomb+fuzz, is likely used to redirect the user to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mezovuduw.ru/wix?keyword=subdecay+f-bomb+fuzz
    • http://about-fb-support.com/how_to_use_onn_wireless_earphonesbrtzm.pdf
    • http://agentsoft.space/gas_station_2_highway_service_game_download0lgtj.pdf
    • http://reduslim-ordina.site/berodupofabaloforomuopl48.pdf
    • http://netlysy.online/zasadabzce1.pdf
    • http://beremoter.online/70927641695iek3x.pdf
    • http://xebupado.mypressonline.com/curriculum_development_in_pakistan_book.pdf
    • http://justamorem.com/742532437516fzdb.pdf
    • http://fuvisetitisenon.mypressonline.com/tiworexevenudamoze.pdf
    • https://cdn-cms.f-static.net/uploads/4417033/normal_60156cdb2c6e0.pdf
    • http://de-bewertung-id-q2e5t23.top/62382770316jwr2m.pdf
    • https://static.s123-cdn-static.com/uploads/4370284/normal_5fc677dce036c.pdf
    • http://twoup-viktoria.online/51524893730occpp.pdf
    • https://cdn-cms.f-static.net/uploads/4485693/normal_602585c8e5e60.pdf
    • http://esclub.pro/mobifogina9it19.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rujimidujek/how_to_use_pomegranate_olive_oil.pdf
    • https://s3.amazonaws.com/muvevanepen/geometric_measure_theory_book.pdf
    • http://zosoluvol.epizy.com/15056078341.pdf
    • https://s3.amazonaws.com/xilasisefi/fokotumoxitat.pdf
    • https://s3.amazonaws.com/memobofilenabon/48556691625.pdf
    • http://xidawowikobotof.rf.gd/7190607439.pdf
    • http://sukokovevaz.atwebpages.com/wokapoxavesa.pdf
    • https://s3.amazonaws.com/nufidibodudulad/nutedavulosaxuxuropi.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_off0000ef06.bin
51060ad3ce6c91a6066f368558968cff123d80eb12353b347acf33433e8247d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF06 5288 bytes
font_01_sfnt_off00010111.bin
a3199bfbc94b38d95cf11c7cb647b7a322d3bd6113c598dbb4ac40990ada6a5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10111 11252 bytes

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