Malicious PDF — malware analysis report

Static analysis result for SHA-256 46401f784890b5d9…

MALICIOUS

PDF

73.2 KB Created: 2021-02-04 02:50:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 506d5a4806398c7263aad7f819a5efd3 SHA-1: 2d9222e22d5035be3a9498a5e1a0358bf607ad60 SHA-256: 46401f784890b5d9b6c9d7b552dd5aaa2c86105f4aa1a6e6b7a91873faf083ac
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a malicious domain, identified by heuristics as a malicious redirector and a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or trojan activity. Although no scripts were extracted, the presence of malicious URLs and the nature of the heuristics suggest the document is designed to trick users into visiting a harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yafferge.ru/123?utm_term=robert+shaw+thermostat+manual+9600 In PDF document text
    • https://tilawifi.weebly.com/uploads/1/3/4/4/134480999/puliputoxulurawomop.pdfIn PDF document text
    • https://davugunibelerab.weebly.com/uploads/1/3/4/6/134612729/94ace15d4c84fe4.pdfIn PDF document text
    • https://rapagifetudi.weebly.com/uploads/1/3/2/6/132682686/demon-nufufet-luselixotepidun-vofupapekeku.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xetasif/smoke_vector_png_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/ripajukowojazesokavu.pdfIn PDF document text
    • http://fifajepetu.rf.gd/brother_and_sister_whatsapp_status_mp4.pdfIn PDF document text
    • http://nebunotan.rf.gd/45495686168.pdfIn PDF document text
    • http://putowop.epizy.com/65475812787.pdfIn PDF document text
    • http://povuputuk.epizy.com/me2_coalesced_editor.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/britney_spears_2007_vma_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/google_android_adb_driver_windows_10.pdfIn PDF document text
    • http://baxovebiw.rf.gd/sheet_music_for_elton_john_your_song.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/ansible_copy_template_overwrite.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_off0000dfad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAD 5616 bytes
SHA-256: 774b3495cb25d39b9cae827ffb960e87789bf3ddaf402ae2989d5fb3cd35fea6
font_01_sfnt_off0000f2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A1 11052 bytes
SHA-256: c3304a4fa7afb9d4edddf2600a63956c9b6bc3d251b12d0e5a8c75e50aa7f663

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