Malicious PDF — malware analysis report

Static analysis result for SHA-256 96866782f8678388…

MALICIOUS

PDF

78.3 KB Created: 2021-03-29 19:25:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 402cd92bfe5b3d66755dbae6ffb78515 SHA-1: 0270eac0ab6682faef3abcfc8dec202917551090 SHA-256: 96866782f867838862011c1958168e641dbb75a1d3dfb3d7a9a8b0b2f66e556b
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm designed for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

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://kuzutuzo.ru/wix?keyword=ram+expander+pro+apk PDF link annotation
    • http://wobafobigo.mywebcommunity.org/kogikawobamesojedijuxowam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451565/normal_6037bb6527813.pdfIn PDF document text
    • https://cdn.sqhk.co/raxedaninaso/hcjtjdY/logo_quiz_online_with_friends.pdfIn PDF document text
    • https://cdn.sqhk.co/palevisi/dB4aggg/sojolijojoxikilux.pdfIn PDF document text
    • http://kidupat.getenjoyment.net/gimosobop.pdfIn PDF document text
    • https://cdn.sqhk.co/xudadidi/yTiaOid/chat_usa_friends.pdfIn PDF document text
    • http://kefijor.mygamesonline.org/both_sides_now_tab_tallest_man.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365656/normal_602f72942a31b.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
    • https://s3.amazonaws.com/susonanezaj/arthrex_acl_tightrope.pdfIn PDF document text
    • https://3c1ad7ec-bfc7-452d-a92a-0d22078d3251.filesusr.com/ugd/c6e823_3c18937de3ef43e18b04f7cace8a4931.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/live_circuit_board_wallpaper_android.pdfIn PDF document text
    • http://lawiferow.myartsonline.com/mupew.pdfIn PDF document text
    • https://d0275d90-c5b4-4c72-b581-d0e2b62fc6dd.filesusr.com/ugd/ee54da_b9e4742802bb4d238168b5b0dc6eaa07.pdf?index=trueIn PDF document text
    • https://51956041-da35-40aa-96c1-085c1f47c80d.filesusr.com/ugd/e6e573_78af1f2025b141d299c7f1c9e1c9f2d7.pdf?index=trueIn PDF document text
    • https://03a45e23-20c9-4b13-8d21-50c2609e56df.filesusr.com/ugd/502f3d_10b6de2aa1dc4120bacdd385952fa8fb.pdf?index=trueIn PDF document text
    • https://41be308f-8a64-4dec-8b30-4937605be974.filesusr.com/ugd/f042fe_3c8e57b3c841437ea7c314b007fb7ccc.pdf?index=trueIn PDF document text
    • http://tebuwawezizafes.onlinewebshop.net/madedenu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE725 4692 bytes
SHA-256: b5fa563ff3a7de46fb6abf381ffbf15ac010c1f323ce7f856a4ec66a51421b78
font_01_sfnt_off0000f6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F4 11312 bytes
SHA-256: bf4ebfa7e50b3c9267c1aaa2091c6c01271db9c781303a7c59f28ac4ac89e7f7
font_02_sfnt_off00011dcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCC 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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