Malicious PDF — malware analysis report

Static analysis result for SHA-256 d82552c5ead7e6bc…

MALICIOUS

PDF

77.9 KB Created: 2021-03-09 19:39:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5fcbae5ee448dea3e2dc38ffd993e2b8 SHA-1: 1c6fd28e957676eb004a68ee3399d6d7d8ec3a4c SHA-256: d82552c5ead7e6bcdfc26ffedf015adcbb4ba019459d0a25c1fb851a2df3550e
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 URI pointing to a suspicious domain, likely intended to host a malicious payload or redirect the user to a phishing site. The document body, though heavily obfuscated, contains text fragments that suggest a lure related to 'reasonableness answer math'.

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://ponafet.ru/123?utm_term=reasonableness+answer+math
    • http://miribut.mywebcommunity.org/aprendizaje_cooperativo_libros.pdf
    • https://static.s123-cdn-static.com/uploads/4424025/normal_5ff861703a716.pdf
    • http://jivusibofonefud.mygamesonline.org/what_is_the_future_of_the_us_economy.pdf
    • https://cdn-cms.f-static.net/uploads/4383314/normal_6012325692942.pdf
    • https://static.s123-cdn-static.com/uploads/4500447/normal_5fff6c8a322fb.pdf
    • https://cdn-cms.f-static.net/uploads/4380692/normal_60293f0de1218.pdf
    • https://static.s123-cdn-static.com/uploads/4380869/normal_5ff1e67128a20.pdf
    • http://zokoxakabu.medianewsonline.com/543165556.pdf
    • http://lologunaw.mygamesonline.org/navien_nr-210a_error_codes.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jirebonudur/62009894765.pdf
    • https://s3.amazonaws.com/kavalukato/bibliographic_entry_format.pdf
    • https://s3.amazonaws.com/lanubili/celia_cruz_quimbara.pdf
    • https://uploads.strikinglycdn.com/files/4c5a2bbf-b77c-4a04-a486-749774c061c4/what_are_the_key_elements_of_writing.pdf
    • https://uploads.strikinglycdn.com/files/3cdd6337-6408-4a75-88d6-30531456eaaa/35908167067.pdf
    • https://s3.amazonaws.com/senodiw/19130873944.pdf
    • https://s3.amazonaws.com/xeruxaxer/agar._io_pc_free.pdf
    • https://s3.amazonaws.com/tojazudibumogab/jebomuvisaxej.pdf
    • https://s3.amazonaws.com/fekife/14234768062.pdf
    • https://s3.amazonaws.com/pevarijidasalop/bexeluxugumov.pdf
    • https://s3.amazonaws.com/vatakefojunib/84362485544.pdf
    • http://wadoromutisagar.myartsonline.com/2741096321.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_off0000f3a7.bin
32c0cbf8889c08e6fb8e05be3740f1c3a512865544ba4627b6c594791bdc21a7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A7 5164 bytes
font_01_sfnt_off00010521.bin
320102c8c6fd6ae7c3535ae77cc22c492f1fcd86a4160f2a4a344d6beb9e4c09
pdf-font-stream PDF embedded font (sfnt) at offset 0x10521 10872 bytes