Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c1854b6b8e5755d…

MALICIOUS

PDF

78.8 KB Created: 2021-03-30 17:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8b84ebc307e30161a3f0c5e64349a06 SHA-1: 5eaf448e491deeca5505d16c6bc9f2cc86d4bf15 SHA-256: 6c1854b6b8e5755d596fa2a71f263bed36e81703916a00f0a5ba80b33a2983dc
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, indicating a high likelihood of malicious intent. The PDF contains an embedded URI pointing to 'dafemum.ru', which is likely part of a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to external, potentially malicious, content.

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://dafemum.ru/123?utm_term=bose+soundlink+color+1+manual
    • https://fikejibin.weebly.com/uploads/1/3/4/3/134331262/kipejuzu.pdf
    • https://static.s123-cdn-static.com/uploads/4447640/normal_5ff7e238e2c59.pdf
    • https://cdn.sqhk.co/zetanitanedo/jdjgjg1/servsafe_manager_test_answers.pdf
    • https://cdn-cms.f-static.net/uploads/4413697/normal_600d1204244e7.pdf
    • https://cdn-cms.f-static.net/uploads/4453129/normal_605f606d01728.pdf
    • https://static.s123-cdn-static.com/uploads/4404287/normal_5fde69fb49dcd.pdf
    • https://cdn-cms.f-static.net/uploads/4463538/normal_5fd91e616c457.pdf
    • https://cdn.sqhk.co/mopewedote/cljbqjg/erosion_and_deposition_worksheet.pdf
    • https://cdn.sqhk.co/luvuxokam/jagcgfh/guidewire_education_site.pdf
    • https://cdn.sqhk.co/voxedijudibo/ggtjdbN/use_wallpaper_word_in_a_sentence_generator.pdf
    • https://bifawodeg.weebly.com/uploads/1/3/5/3/135348479/7299296.pdf
    • https://cdn.sqhk.co/muvotugi/jhig8ge/canadian_entrepreneurship_and_small_business_management.pdf
    • https://cdn-cms.f-static.net/uploads/4447669/normal_5fda93526bdb0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/muvevanepen/61172058525.pdf
    • http://kewivesoxafa.rf.gd/64201088527.pdf
    • https://s3.amazonaws.com/wujapu/dell_precision_490_motherboard.pdf
    • http://zagizub.rf.gd/jogajarisikiwedewuj.pdf
    • https://s3.amazonaws.com/wexukufedepim/cbc_national_reporters.pdf
    • http://sabulawum.rf.gd/carnot_cycle_in_thermodynamics.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_off0000f3c8.bin
144fc8838d5fad7ab608ca6bebb29bcb49e5b4939fb7ae794b53fdfb95b9bf9c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C8 5248 bytes
font_01_sfnt_off00010592.bin
393af78f31f5947d6fa7c206bb86fd87254a850eca9c557e3dab5bc2b0e04dc8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10592 12148 bytes