Malicious PDF — malware analysis report

Static analysis result for SHA-256 af45cefd14b791d9…

MALICIOUS

PDF

73.6 KB Created: 2021-04-18 05:40:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9abb442c0461fd33f04b1282ad51e77e SHA-1: d6b7b34f79af428bc6123bddbb663020dd642b8f SHA-256: af45cefd14b791d9472520b340c8f32d0039ab5ca5fb74b6adbcd61823ee1050
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/strik?utm_term=myers+briggs+personality+test+4+categories PDF link annotation
    • http://kazimibi.getenjoyment.net/73864784194.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490272/normal_5ff6b2e6e9615.pdfIn PDF document text
    • http://melomone.scienceontheweb.net/battle_angel_alita_manga_pl.pdfIn PDF document text
    • https://cdn.sqhk.co/xaloxezajaga/V6zheaD/traps_dungeon_keeper.pdfIn PDF document text
    • https://cdn.sqhk.co/tavaxiwugo/jmphhDc/58045845415.pdfIn PDF document text
    • http://liwexun.mywebcommunity.org/nusenerawevedegosenokomif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494433/normal_5fe643517a6d6.pdfIn PDF document text
    • http://nawireg.22web.org/war_and_peace_characters_wiki.pdfIn PDF document text
    • http://kixiwogazu.sportsontheweb.net/arthur_clarke_the_sentinel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zaxefemebidaz/33516773279.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d273d07d-99b8-40c8-8267-9966404ce663/vazigofosoge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/544f572b-b601-4c9b-b561-6c78d7c14d89/the_penelopiad_chapter_9_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/marketing_internship_cover_letter_template.pdfIn PDF document text
    • http://jojexapopexevof.epizy.com/financial_accounting_and_reporting_part_2.pdfIn PDF document text
    • http://xelefufod.rf.gd/xolelopizotite.pdfIn PDF document text
    • http://timodetunidup.epizy.com/stopwatch_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/endangered_animals_research_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_off0000e14e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14E 5436 bytes
SHA-256: 3d0837683276e5ed776040b6010a6e604144c0f97ca7e58fd00951258ec9a42c
font_01_sfnt_off0000f3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F8 11024 bytes
SHA-256: 2cf5b8daaa57236bc3b859d415a8e7e9d3f9cdf4e3c42c3224e934a9e3d251fc