Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b23c316e21dd008…

MALICIOUS

PDF

71.1 KB Created: 2021-06-12 13:09:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 28baaeee79aebf5842f9284fca60c7bc SHA-1: 59d4b675ff2db41a0ad41a8e252306c56bc68415 SHA-256: 1b23c316e21dd008ad28d09504aa65a6e0fa0e178bd40cf849d57e5feccf0158
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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm or phishing attempt. The heuristic 'SE_SECURITY_BYPASS' indicates the document instructs the user to disable security software, a common tactic in malicious documents to facilitate further exploitation or payload delivery. No scripts were extracted, but the presence of numerous external links and the security bypass instruction strongly suggest an intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://crysiq.ru/pbw?utm_term=pubg+connection+timeout PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426059/normal_600efd3dcffa7.pdfIn PDF document text
    • https://dekupepevimozis.weebly.com/uploads/1/3/0/7/130738652/jopazalet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419191/normal_5fc5cae915a4b.pdfIn PDF document text
    • https://sadavixiji.weebly.com/uploads/1/3/5/3/135333995/064d3d315ac8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487399/normal_5fd262673cd3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374520/normal_600b5dc373fad.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4464327/normal_60b27285abbc7.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/90e4c14e-2181-4abf-b422-0aa224dc86fe/how_to_change_name_on_license_nc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42a95fb7-6420-4ac6-804c-a3dc27aadc82/venez_approchez-vous_partition_gratuite.pdfIn PDF document text
    • http://vonodatob.pbworks.com/w/file/fetch/145082361/15961554682.pdfIn PDF document text
    • http://pezaloribed.pbworks.com/w/file/fetch/144504273/hamstring_tear_exercises.pdfIn PDF document text
    • http://tagexoba.pbworks.com/f/comportamiento_organizacional_stephen_robbins_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e702baf0-6728-4fc6-8d19-beb42ccea224/kugalinuza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1eb3f558-1f33-43e0-aed2-f46bc1d20237/miniature_crochet_teddy_bear_patterns_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fab0870-a7a7-490c-833a-b7a80e687155/27873658002.pdfIn PDF document text
    • http://mumasenekera.pbworks.com/w/file/fetch/145182261/joxevatidovimegug.pdfIn PDF document text
    • http://nugurafuge.pbworks.com/f/pied_beauty_critical_appreciation.pdfIn PDF document text
    • http://subazim.pbworks.com/w/file/fetch/144545793/nidiwufu.pdfIn PDF document text
    • http://subazim.pbworks.com/f/seramuwogusagusamepuwemu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a33ec38a-26ec-484c-bbd1-e775e96d4346/7059392637.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbc76be8-f34f-4300-bca4-564d887188c3/nasukomizajiwigunujozurax.pdfIn PDF document text
    • http://pebegijopolo.pbworks.com/f/what_are_the_3_types_of_media_codes.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_off0000dbb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB4 4744 bytes
SHA-256: 25c8bb7adcf5048538431df2e04eedbfb5487f75361b7a7ae84e47fda440ee12
font_01_sfnt_off0000ebd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD8 10256 bytes
SHA-256: 91ad9ca93671a7272a7409774e73425a3a5f0f7e3e04846389d13f768e2412c8

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