Malicious PDF — malware analysis report

Static analysis result for SHA-256 61ff7909b037744d…

MALICIOUS

PDF

82.2 KB Created: 2021-04-22 05:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 9443d2a0841aeded09659f16ff5a89dd SHA-1: f44694019efa88aa0fb08c213d27461fd94e3734 SHA-256: 61ff7909b037744d9822d8bd99f9af1cb8a8e262178f6c5349dd954c365b9ab9
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with many pointing to disposable domains and employing UTM parameters, indicative of a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites.

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://leonvi.ru/strik?utm_term=how+to+start+html+project PDF link annotation
    • http://fartook.online/create_react_app_drag_and_drop4jhr4.pdfIn PDF document text
    • http://llloooodddd.space/261272802177j1vb.pdfIn PDF document text
    • http://ig-mediateam.net/speak_book_one_summaryc0yc3.pdfIn PDF document text
    • http://kurs1.xyz/spy_shop_online._co._uk_limitedx2s7t.pdfIn PDF document text
    • https://wutekeli.weebly.com/uploads/1/3/1/3/131379380/rarenoralikarudu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493553/normal_60386cb43e6f9.pdfIn PDF document text
    • http://hiziryigit.online/how_to_install_honeywell_rth2300_thermostat_with_2_wiresko8rt.pdfIn PDF document text
    • https://musaseruvadix.weebly.com/uploads/1/3/4/5/134581888/keseruwipiximejadim.pdfIn PDF document text
    • http://mon-cmso.best/48536623755731f1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445130/normal_5fc8d5f77cb5f.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/23eef59f-94bf-4440-a59a-a173d30aa20d/what_is_the_difference_between_a_dt466_and_a_dt466e.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78d7f6a6-7cef-4b81-b8f2-89dfc4e53e70/wubur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df8e54b6-f97a-4437-8d33-221944c29819/39211970250.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3c939a3-7953-48e7-a642-d35f0f5c63ee/que_tipo_de_gobierno_existe_en_espaa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ebc6ea9-c683-4fef-852f-3919524e1394/58974756475.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4724ffc9-21e3-499c-a056-f70ff87f716a/present_perfect_tense_exercises_with_answers_focus_english_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36823db5-1f49-41fe-8322-c9cab068949c/how_to_use_blender_2.81.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9587f62c-cc08-4c12-8083-84e963a76c19/bapumaxurebujase.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_off00010096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10096 5304 bytes
SHA-256: 90861f93843664651cfa0757e1e4dd3f482f8257ce8796674dcc29daf2ba984f
font_01_sfnt_off00011282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11282 12236 bytes
SHA-256: 902c9f9b5a61a202ac836e67391980e33f6aa6575ec6ac6d711ab5f537b49a62

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