Malicious PDF — malware analysis report

Static analysis result for SHA-256 3606dcc5524c680c…

MALICIOUS

PDF

73.4 KB Created: 2021-03-19 03:51:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e443a3a94131a34b1b58a3eee76d9211 SHA-1: 7287932d039aed0679f23a0621cac66ee6abb482 SHA-256: 3606dcc5524c680cdce80e1f709d79d60a3213af2597c3759ced5786dc745c9c
96 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. An embedded URI points to a suspicious domain, likely serving a phishing page. The document body, though truncated and obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly indicate a phishing 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://resalured.ru/strik?utm_term=nys+driver%2527s+permit+test
    • https://cdn.sqhk.co/fikubife/AYbijgg/kof_98_um_ol_china_download.pdf
    • https://cdn.sqhk.co/jalosemuv/icgfTAA/52393580118.pdf
    • http://kitukotobov.medianewsonline.com/algebraic_expressions_worksheet.pdf
    • https://cdn.sqhk.co/zaviresodew/ejhhMii/46284691818.pdf
    • http://xuwuvewisin.mypressonline.com/97290651418.pdf
    • https://cdn.sqhk.co/mogizilo/ibDiiic/birotatar.pdf
    • https://static.s123-cdn-static.com/uploads/4366381/normal_5fcfa21ad47e2.pdf
    • https://cdn.sqhk.co/goropakuvoge/Jgiwhjs/pawunabulojar.pdf
    • https://static.s123-cdn-static.com/uploads/4422382/normal_6008ff34a88fc.pdf
    • http://fonudesuwobulud.mygamesonline.org/polytheism_vs_monotheism.pdf
    • https://cdn.sqhk.co/soxuwutitaw/sujfjcl/pubufidadime.pdf
    • https://cdn.sqhk.co/belerudoxej/Siejahd/spiral_ham_cooking_time_350.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rodakarugupoko/what_are_the_best_workouts_to_get_bigger_arms.pdf
    • https://uploads.strikinglycdn.com/files/5be970b5-a077-462d-96fc-18776458fe86/lazuw.pdf
    • https://uploads.strikinglycdn.com/files/db15809f-e6cc-4826-af00-0b2a7540343c/xozegominasakupetetixemij.pdf
    • http://domebiwek.myartsonline.com/gafobejumukulegizonipe.pdf
    • https://uploads.strikinglycdn.com/files/e9ad5644-b1fa-4cfc-b34f-7b5116253bbd/60968715117.pdf
    • https://s3.amazonaws.com/fidefofudi/40508814215.pdf
    • https://uploads.strikinglycdn.com/files/89bafa72-8b00-4bf5-b171-5921f2cc5903/basic_sentence_structure_exercises.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_off0000e50b.bin
826a73a8d1e6a08357cbe3e50a8fb1d5ff265f6901c31066f6b24b0b465c7992
pdf-font-stream PDF embedded font (sfnt) at offset 0xE50B 5028 bytes
font_01_sfnt_off0000f62d.bin
0e7cca1211d119ec87f14a8be156589f2ce7deb4afe3ee9229be39e8a54717a2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF62D 10068 bytes