Malicious PDF — malware analysis report

Static analysis result for SHA-256 41d7b74678e45b7a…

MALICIOUS

PDF

101.1 KB Created: 2021-02-11 20:59:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 761282946eb36e5d195ae6736c270b0a SHA-1: aa8f25b48bd139be914d35621eebf8add95ceed3 SHA-256: 41d7b74678e45b7a58f9ddac16f45ea4d866be5264b50ba462bb5cfbe3d47677
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://crophysi.ru/wb?keyword=field%20trip%20report%20geology In PDF document text
    • https://cdn-cms.f-static.net/uploads/4380384/normal_5fd34ab047bb5.pdfIn PDF document text
    • https://cdn.sqhk.co/nugofonavuf/Sjihjig/27694032708.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458144/normal_6000a2068b819.pdfIn PDF document text
    • https://cdn.sqhk.co/mofijovelu/icQjcBx/criminal_case_game_free_download_for_windows_xp.pdfIn PDF document text
    • https://cdn.sqhk.co/vakamuzawa/SfOJz3b/12388230382.pdfIn PDF document text
    • http://zespodsvetkoy.site/neo_lms_login_university_of_san_agustine1kpc.pdfIn PDF document text
    • http://delufarado.22web.org/lipless_crankbait_template.pdfIn PDF document text
    • http://jumbochecker.com/22235761618berkx.pdfIn PDF document text
    • http://olx-delivery.cc/feminabilubuzedg63on.pdfIn PDF document text
    • https://cdn.sqhk.co/kawinojos/iaijHic/my_bt_mobile_usage.pdfIn PDF document text
    • http://nnorm-id.com/jazz_piano_sheet_music_musescorexdzfa.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://dajejat.rf.gd/alpinestars_gloves_fitting_guide.pdfIn PDF document text
    • http://gotenekopibijo.epizy.com/behringer_xenyx_802_mixer_service_manual.pdfIn PDF document text
    • http://nokefibazapowem.rf.gd/manualidades_faciles_para_vender_para_nios.pdfIn PDF document text
    • http://kijemuf.epizy.com/89540946030.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13925 1944 bytes
SHA-256: c052f2a682a1af7f75a3d87f716bc9678989379ec17fcb9a57f21fc5c3a4f630
font_01_sfnt_off0001425b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1425B 4476 bytes
SHA-256: 2bde74755de50546e02a078704d7c9c14941e8bb9b160229e34aa9f03cdaa264
font_02_sfnt_off000151ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151AB 11656 bytes
SHA-256: c34de1be29d2d64c902d6be031d1f12f19d5dbdb32c5a12351c839d4a2991c8a
font_03_sfnt_off00017871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17871 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

Open this report in the interactive analyzer, or submit your own file for analysis.