Malicious PDF — malware analysis report

Static analysis result for SHA-256 43a803933f4e73da…

MALICIOUS

PDF

73.3 KB Created: 2021-03-02 12:10:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c517f3628149ce5ce06daf07b03c082f SHA-1: 4c0605a6dd5b111cb99591253460a9df67e75a13 SHA-256: 43a803933f4e73dae5483cea6b623f8eb0fdf2c53a5e12b1729119e0bcac4dcd
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that is likely used to deliver a secondary payload or redirect the user to a phishing site. The document body, though heavily obfuscated, suggests a lure related to 'question and answer session pictures'.

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://xajibur.ru/wix?keyword=question+and+answer+session+pictures PDF link annotation
    • http://mogimetekojubar.scienceontheweb.net/how_to_start_a_ketogenic_diet.pdfIn PDF document text
    • https://cdn.sqhk.co/dubutemaruxu/2Zhegjs/50439998311.pdfIn PDF document text
    • http://momarivido.mypressonline.com/what_books_do_you_read_in_ap_english_language.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444370/normal_6024aae59b34e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416495/normal_5fe15479801d5.pdfIn PDF document text
    • http://nowukusox.mypressonline.com/betavadogumerex.pdfIn PDF document text
    • https://cdn.sqhk.co/pilozarager/gHhiNuj/talewinenuni.pdfIn PDF document text
    • https://cdn.sqhk.co/vupapevixu/gdgdjad/minecraft_pickaxe_clicker.pdfIn PDF document text
    • https://cdn.sqhk.co/gemesikexo/djjje9C/8761444060.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486522/normal_5fd7c20a53534.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/fivoda.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/54410634186.pdfIn PDF document text
    • https://s3.amazonaws.com/benuka/jitojukutefudunixug.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/jafepusefedoramemerokari.pdfIn PDF document text
    • http://xemigososefof.atwebpages.com/honda_generator_troubleshooting_manual.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FA 5188 bytes
SHA-256: 3b089745789b4dbce6ed2d286e3e1f33eafb3d1b096f0f45681e4add08fc808b
font_01_sfnt_off0000f4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C2 10380 bytes
SHA-256: 574a5a75ca4e67cb58e4f22606b018fa2ab405e970bb18222f1a53a0a41cfe91