Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ccf858dd8e4a9a…

MALICIOUS

PDF

78.3 KB Created: 2021-03-23 03:01:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7f32af23c79df41acf0907c8b6fc9bad SHA-1: 5b009f45cf39f1ab8bb938e7ca22d15207014b57 SHA-256: 81ccf858dd8e4a9a86d255657ef214b56412a965ac575790eac4b580b192de41
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that directs users to a suspicious domain, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URI heuristic suggest it's designed to exploit users by presenting a seemingly innocuous topic to mask a malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/strik?utm_term=how+to+clean+new+construction+hardwood+floors
    • https://cdn-cms.f-static.net/uploads/4450719/normal_601de7b81c586.pdf
    • https://cdn-cms.f-static.net/uploads/4453326/normal_602b98fd3c587.pdf
    • http://zhigina.ru/fujikapakogipifumoxiwoeiypt.pdf
    • http://maska-respirator.shop/autocad_converter_software_freeno1xc.pdf
    • https://cdn-cms.f-static.net/uploads/4481400/normal_604b39684827e.pdf
    • http://goldstein.berlin/learn_lean_six_sigmavhjj9.pdf
    • http://lezigovedavide.getenjoyment.net/kinebisofav.pdf
    • https://cdn-cms.f-static.net/uploads/4378175/normal_5fdb635a48a2b.pdf
    • http://zokugorevat.mywebcommunity.org/surah_yasin_file.pdf
    • https://cdn-cms.f-static.net/uploads/4467005/normal_60295d639c400.pdf
    • http://pegijegur.mygamesonline.org/autocad_mechanical_drawings_download.pdf
    • http://idealslimitaly-ufficiale.site/kenmore_elite_coffee_grinder_and_brewer_manualy20th.pdf
    • https://cdn-cms.f-static.net/uploads/4374537/normal_6020a8b034b10.pdf
    • https://static.s123-cdn-static.com/uploads/4459468/normal_6008932a6a4bc.pdf
    • http://gomigapujasep.sportsontheweb.net/wokijasaxip.pdf
    • http://true-board1.club/inside_reading_4_answer_key_unit_33xcyi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://kipejefanowisu.atwebpages.com/letter_d_worksheets.pdf
    • http://tebaputazaxuva.myartsonline.com/the_art_nouveau_style_book_of_alphonse_mucha.pdf
    • http://nojikigor.myartsonline.com/mario_benedetti_te_quiero.pdf
    • http://jadivepijuga.myartsonline.com/advantage_and_disadvantage_of_partnership.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9cc.bin
7f10f9882607337497ed686ed8edf4e8a61acbe9f04891661de4ea778151c708
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CC 5044 bytes
font_01_sfnt_off0000faef.bin
10e8898fd1396b7cf353d265fc341dac3107669808d80fddfe46ae8d7323bb03
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEF 10160 bytes
font_02_sfnt_off00011dc4.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC4 4324 bytes