Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b1f1bb67086ef14…

MALICIOUS

PDF

98.0 KB Created: 2021-04-17 12:20:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: cc61952d55caad13d10a1270084d15b1 SHA-1: b054d18be2d7cde9a1e031ed7051a9307789632d SHA-256: 3b1f1bb67086ef14775028e87649539ddf1873e19fdaf457c7b62c95bb4453a1
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'dafemum.ru'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a malicious URL within the document body suggests an attempt to redirect the user to a malicious site, likely for phishing or to download a secondary payload. The ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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/strik?utm_term=wordpress+templates+free+download In PDF document text
    • https://cdn.sqhk.co/loganidob/VifOG9l/crash_of_cars_online_generator.pdfIn PDF document text
    • http://smotrikino.fun/norividumetibifoduduvh9n6.pdfIn PDF document text
    • https://cdn.sqhk.co/wadusazilox/jbijij1/idle_balls_mod_apk_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/moviferu/1jz0Lhb/4_pics_1_word_6_letters_eggs.pdfIn PDF document text
    • https://cdn.sqhk.co/tibidimewako/gjWeac4/veselidaxapipav.pdfIn PDF document text
    • http://navalny.design/how_to_make_origami_heart_with_paperg1kyi.pdfIn PDF document text
    • http://help-bluebadgecustomer.com/sodunafemedogukukiki8xkx9.pdfIn PDF document text
    • http://idclick.cash/ligoleza3r62p.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba5e5bf0-f42b-4b59-b8c2-a77b850d28bc/rifulasurixovosuzivikes.pdfIn PDF document text
    • https://s3.amazonaws.com/padanivozeb/android_10_samsung_s9_plus_fecha.pdfIn PDF document text
    • https://s3.amazonaws.com/pekatikisuruki/5853756500.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00f58756-38b4-4a1e-9f78-64eca83f1267/wazog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ce9d48c-7617-4dfc-a0d4-9651ed2ed957/60530038910.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/80067233795.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aafbce5c-0734-4aa1-9b0f-900abc665ab0/sokivifoxadez.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/zipaxexejonazuv.pdfIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/apa_publication_manual_ebook.pdfIn PDF document text
    • https://s3.amazonaws.com/goneduzum/lavedomi.pdfIn PDF document text
    • https://s3.amazonaws.com/midizaxopazeji/us_army_dress_uniform_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/bexowezutufubav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e63649f3-21f1-411d-b091-bfd5271e32bf/dubume.pdfIn PDF document text
    • https://s3.amazonaws.com/nagudo/zapiwujopugagewesibojutu.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/what_equipment_is_used_for_filtration.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/82908279800.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_off000142d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142D0 5292 bytes
SHA-256: 891f2b58d21d5675d45bf2930c4b7ad5505f9cae17b79942762b58449e49a5a8
font_01_sfnt_off000154d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154D0 11104 bytes
SHA-256: 966bc8420ddef4c4d776cb6c04f3dace275b1f6a4aafbb878d901d8c868b0a1b

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