Malicious PDF — malware analysis report

Static analysis result for SHA-256 818c1bece60aad2a…

MALICIOUS

PDF

70.6 KB Created: 2020-12-25 20:36:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: f5d178b3c4b95a07c580a83d533cbe68 SHA-1: 9d9a33838dc065e6a3dd5582e11ea6f2bf773aae SHA-256: 818c1bece60aad2a844c905449f8565094b3ae0750b146dc24ee540cd11e612b
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to disposable hosting services and redirectors, indicating a link farm designed to distribute malicious content. The primary malicious URL identified is https://cctraff.ru/strik?utm_term=risks+of+space+exploration+list. The document's structure and the presence of numerous external links suggest it is part of a phishing or redirection campaign.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/strik?utm_term=risks+of+space+exploration+list In PDF document text
    • https://jikolugoxolij.weebly.com/uploads/1/3/1/3/131379047/e21b1f06.pdfIn PDF document text
    • https://rebeluzibefu.weebly.com/uploads/1/3/4/6/134619862/631695.pdfIn PDF document text
    • https://gedevoliritigit.weebly.com/uploads/1/3/4/6/134686631/cc4844454f3d.pdfIn PDF document text
    • https://vonepegoparopew.weebly.com/uploads/1/3/4/3/134352316/jexowupaj.pdfIn PDF document text
    • https://kimidagox.weebly.com/uploads/1/3/4/4/134470984/fenerovunugulobuvud.pdfIn PDF document text
    • https://tusidotug.weebly.com/uploads/1/3/4/4/134482214/lomiwawa_mezovavigibuz_jemifukorane.pdfIn PDF document text
    • https://foragiluk.weebly.com/uploads/1/3/4/3/134374590/pevezo-guxezu-xaweboteserab.pdfIn PDF document text
    • https://vuzejugusu.weebly.com/uploads/1/3/4/4/134486163/jixetunerol.pdfIn PDF document text
    • https://kawuzuke.weebly.com/uploads/1/3/1/6/131606938/375297b.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/08d1234d-1063-4061-8af2-87463d39605a/lfs_0.5_z28_jant_program.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a8dbde9-466c-40c6-841f-cbbf6ca715be/dre_beats_ep.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/kotor_2_companion_leveling_guide.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_off0000d752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD752 5148 bytes
SHA-256: 9572eab98661644bc799d0aa0903945749228cd36be3b5b2e1c729873000d6cc
font_01_sfnt_off0000e8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F1 10808 bytes
SHA-256: 00bd5693bb6d055832fc89f58835e311b5056673d09f59dce71167d79258751a

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