Malicious PDF — malware analysis report

Static analysis result for SHA-256 173723860efa6687…

MALICIOUS

PDF

73.6 KB Created: 2021-02-23 09:30:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9646b0d1602ccee229298792e4f18799 SHA-1: f973b0eb5e852c6f2743916de5e55779e9191f76 SHA-256: 173723860efa6687fe22a78e9af890ea08fb77b7ab4a74a71fbba292b88ded28
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, which is characteristic of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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://baarspo.ru/strik?utm_term=how+much+does+a+special+needs+teacher+make+an+hour PDF link annotation
    • https://cdn.sqhk.co/pazaxefuma/gdShbVS/nujix.pdfIn PDF document text
    • https://cdn.sqhk.co/nowavutu/bNEIwjP/business_system_analyst_resume_skills.pdfIn PDF document text
    • https://vuzizakepavojen.weebly.com/uploads/1/3/1/4/131484090/jotemafej.pdfIn PDF document text
    • https://cdn.sqhk.co/lajojeletab/eJ0hjia/how_to_get_super_hexagon_for_free_ios.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445130/normal_600fc2328ce1b.pdfIn PDF document text
    • https://zonanasuwovu.weebly.com/uploads/1/3/2/6/132683154/6833469.pdfIn PDF document text
    • http://aires.fun/jaxisopupulofidexejivazuzvaqq0.pdfIn PDF document text
    • https://cdn.sqhk.co/wejewenu/cJshaSe/boss_rc-_505_loop_station_tabletop_looper.pdfIn PDF document text
    • https://cdn.sqhk.co/mifigatira/Pgehbjf/coc_clash_of_clans_download_apk.pdfIn PDF document text
    • http://busurman.space/how_to_lead_intercession_prayermym5u.pdfIn PDF document text
    • https://dazowuxope.weebly.com/uploads/1/3/4/3/134319454/sudafobagevuv-lumako.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455399/normal_5fc9a6c597ec9.pdfIn PDF document text
    • http://idealica-uficiale.website/aarariraro_video_song_hdzukjz.pdfIn 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://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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD474 5312 bytes
SHA-256: 0672e59775be8bad4ac3321c83fa02678258d63a76822b10634f93047e34602c
font_01_sfnt_off0000e665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE665 10828 bytes
SHA-256: a1b30f0782384a3e3e6f5547aa1077fbd4f3781a7dc4b62085d33f7fdb35ef36
font_02_sfnt_off00010b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B16 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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