Malicious PDF — malware analysis report

Static analysis result for SHA-256 8422bc84d7ceba04…

MALICIOUS

PDF

101.5 KB Created: 2021-01-19 23:25:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: cb655eb134b622ddd6a1dde276d2c4aa SHA-1: c08984ebd96a394e3dcd6a8b3d736e3054df2bc3 SHA-256: 8422bc84d7ceba042687c80ce45fb46fafc4bfc8dc6575687fe6149f4e3aadea
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or redirection scheme. The presence of embedded URLs and the PDF structure point towards an attempt to trick users into visiting malicious sites.

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://crophysi.ru/123?utm_term=oedipus+rex+pdf PDF link annotation
    • https://cdn.sqhk.co/wugunifikezu/Jdgeehc/faxozenolixikajuma.pdfIn PDF document text
    • https://site-1174138.mozfiles.com/files/1174138/silovuvutebobadej.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485173/normal_600668aaaea15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410214/normal_5f9daf99bca51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404290/normal_5faf4026197ea.pdfIn PDF document text
    • https://site-1174141.mozfiles.com/files/1174141/basic_accounting_equations_cheat_sheet.pdfIn PDF document text
    • https://site-1191564.mozfiles.com/files/1191564/milling_machine_cutting_tools_for_sale.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407807/normal_6002adc86a730.pdfIn PDF document text
    • https://site-1166618.mozfiles.com/files/1166618/relomebufidarubejilun.pdfIn PDF document text
    • https://cdn.sqhk.co/dodamewope/ihflgiF/break_it_down.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457320/normal_5fc56abdade19.pdfIn PDF document text
    • https://site-1176273.mozfiles.com/files/1176273/rope_hero_frog_ninja_apk_mod.pdfIn PDF document text
    • https://site-1174439.mozfiles.com/files/1174439/lego_jurassic_world_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/vakanaju/D9eXhfC/mining_inc_game_advanced_manipulators.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://balazetesu.epizy.com/converter_exo_to_mp4_android.pdfIn PDF document text
    • http://vijanemafe.rf.gd/gta_vice_city_3_cheats_android.pdfIn PDF document text
    • http://sujotoginejo.rf.gd/bubojalonubaguwerepobi.pdfIn PDF document text
    • http://wekidezeze.epizy.com/vba_excel_vlookup_from_another_worksheet.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_off00014cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CC6 4888 bytes
SHA-256: e49abf651f42e09017f777137c389e64ef9eb3d3c6e572bcd6924d432ffb0ad9
font_01_sfnt_off00015d79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D79 13768 bytes
SHA-256: cc6b5d5ca57a381607ab7766f76b390e2f3e1e39b409e8e563c33b24a598f10a

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