Malicious PDF — malware analysis report

Static analysis result for SHA-256 96100f87c19b5b5a…

MALICIOUS

PDF

83.9 KB Created: 2021-03-01 21:58:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: f03578ba6126ed6b5c2680475e59638a SHA-1: b15edc827d550a3e2d6f611f26f0e61bf7a63983 SHA-256: 96100f87c19b5b5aaff710311ac8e30df13dd2dc086d21358f469b33cd89115b
226 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is a PDF document that contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document attempts to trick the user into installing a browser extension or update. ClamAV detection and ML classification confirm its malicious nature. The embedded URLs likely lead to malicious sites or further download stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://pelibifir.ru/strik?utm_term=watch+the+twilight+zone+movie+online+free+streaming PDF link annotation
    • http://bisibometixo.mywebcommunity.org/emerson_50_inch_tv_wall_mount_screw_size.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387035/normal_5feb014bc04d5.pdfIn PDF document text
    • https://nukusuruv.weebly.com/uploads/1/3/1/8/131857442/2649651.pdfIn PDF document text
    • https://gizutiki.weebly.com/uploads/1/3/4/4/134478998/3204874.pdfIn PDF document text
    • http://clientbluebadge.com/number_word_flashcards_printable_1-10bpppj.pdfIn PDF document text
    • http://nesebonuvobeju.getenjoyment.net/85906220532.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412151/normal_6037bed244200.pdfIn PDF document text
    • https://vimedapajabapi.weebly.com/uploads/1/3/5/3/135309909/muvamug_gimedolifuxaxon.pdfIn PDF document text
    • http://taptopbot.com/jeepers_creepers_1_full_movie_downloadg1ejx.pdfIn PDF document text
    • http://sellforce.ru/sibezedkvr4.pdfIn PDF document text
    • http://introdom.ru/wyze_plug_alexa_server_is_unresponsive2phxl.pdfIn PDF document text
    • https://rokajovata.weebly.com/uploads/1/3/4/3/134376264/7489230.pdfIn PDF document text
    • https://wadezadoli.weebly.com/uploads/1/3/0/9/130970015/257433.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404975/normal_5fe9f311aab39.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00010b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B93 5512 bytes
SHA-256: ca314fab9cedc93897a902bacc6b88265c48bc130baa5583028b206f6ef5d051
font_01_sfnt_off00011e4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4F 10700 bytes
SHA-256: 92db4d39c81d6a76bc032db462556c1a041f8b436d291b779c976f9f615ff74e

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