Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb919716663baae0…

MALICIOUS

PDF

82.0 KB Created: 2021-03-04 09:14:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3e6eea2bde135d13f7d3372997ddd605 SHA-1: c35b102ccc4bbbc705d8db92c096f4353505bdac SHA-256: fb919716663baae0ea060c1ef50fa8ce75afdc1daef3208c08e4106846e4800f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 for Pdf.Phishing.Trojan and an ML classifier indicating maliciousness. The document contains numerous external URIs pointing to a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the heuristics strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/wb?keyword=the%20psychology%20of%20winning%20summary%20pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4486971/normal_5ff2a74a3a326.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374522/normal_600b5459d1330.pdfIn PDF document text
    • http://silkhfig.bid/how_to_connect_my_bluetooth_mouse_to_my_mac4gqll.pdfIn PDF document text
    • http://joxitikoki.getenjoyment.net/best_way_to_learn_scratch_programming.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372955/normal_601634c7a81a2.pdfIn PDF document text
    • http://gatowixipeba.mywebcommunity.org/how_long_does_a_stihl_battery_last.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448116/normal_5fd771aee3313.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466996/normal_601d3974ba325.pdfIn PDF document text
    • http://dajexori.mypressonline.com/free_california_residential_lease_agreement_form.pdfIn PDF document text
    • http://zesegalos.scienceontheweb.net/briggs_and_stratton_push_mower_oil_drain_plug.pdfIn PDF document text
    • http://usesucre.pro/nato_phonetic_alphabet_termsoilm0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469850/normal_5ffb5af73924e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402262/normal_5ff8aa827f250.pdfIn PDF document text
    • http://cocobuka3.xyz/9763221440047slw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478141/normal_603fb3884d4b4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ziwemasux.myartsonline.com/modal_verbs_worksheets_for_grade_6_with_answers.pdfIn PDF document text
    • http://radiviwix.onlinewebshop.net/fender_twin_reverb_silverface_vs_blackface.pdfIn PDF document text
    • http://bepolujogox.atwebpages.com/rogelikavuvixelajabusiwi.pdfIn PDF document text
    • http://zijiwaras.onlinewebshop.net/buvomi.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_off00010446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10446 5712 bytes
SHA-256: a750b53ba0758bcb9bf76a630d452596efea30a5ddb01e72b8c09f1f82c086a6
font_01_sfnt_off0001179f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179F 10276 bytes
SHA-256: 7d523d094ac036830fb44847343cf6d5a9be657d51c1c52a047aab9b6533d060

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