Malicious PDF — malware analysis report

Static analysis result for SHA-256 18cd1060a0b81842…

MALICIOUS

PDF

153.2 KB Created: 2021-02-11 05:17:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 48243197cc917b163b57cfd953036caa SHA-1: a17a92de3f81faa1a83dcd5b49fd9a0ab5cc0276 SHA-256: 18cd1060a0b81842ec150dfcb9114cbd994585647abbc8f607bd2d35cc11da1c
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to disposable domains and link farms, suggesting a phishing or scam lure. The PDF structure and embedded content are consistent with attempts to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://druttle.ru/123?utm_term=man+is+born+free+and+everywhere+he+is+in+chains+essay PDF link annotation
    • https://cdn.sqhk.co/dutebosatu/Yggjcij/fufoxa.pdfIn PDF document text
    • https://tunuwadubozowe.weebly.com/uploads/1/3/4/3/134363043/bitisakim.pdfIn PDF document text
    • https://cdn.sqhk.co/mezutowede/ghhb0Vf/declaration_dsi_revenus_2018_formulaire.pdfIn PDF document text
    • https://raxuzorozejataw.weebly.com/uploads/1/3/4/0/134042373/wogalilejikukufef.pdfIn PDF document text
    • https://cdn.sqhk.co/lewivapawo/dU2gdeb/39697626062.pdfIn PDF document text
    • http://wibusutozojoz.iblogger.org/zovuvixusarulinomod.pdfIn PDF document text
    • https://nutakiderovex.weebly.com/uploads/1/3/4/6/134622867/sebin_xefuzupeb_masagitidadi_gonubelag.pdfIn PDF document text
    • https://xelexezeni.weebly.com/uploads/1/3/0/7/130740222/tisadi_guzerote_xubare_pilusitiwetirin.pdfIn PDF document text
    • https://jirozonuk.weebly.com/uploads/1/3/1/6/131606844/e2ab168d15bd80f.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/ginutu/toputawifemilixeke.pdfIn PDF document text
    • https://s3.amazonaws.com/gurafoga/acute_lower_limb_ischemia_guidelines.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_off00021f4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21F4E 5476 bytes
SHA-256: 1a0bbfa0d1c7b4b1056e1a63c84721f22ba8f705f595f4b0616b11fb8b92c2f1
font_01_sfnt_off0002320e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2320E 11276 bytes
SHA-256: db26acde039168747ba729aa128fc3414c5ad8a68cc1e4b420b068710a8a2508

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