Malicious PDF — malware analysis report

Static analysis result for SHA-256 678fde150cde74e1…

MALICIOUS

PDF

72.5 KB Created: 2021-02-22 07:40:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6ee7f75b4593c138d4fdb302fc532413 SHA-1: 1e2810f289b26808deb9c1131630eb3bef64965e SHA-256: 678fde150cde74e10ff1650a7fec5d46b03e5aa93f9f6c822153b773ce96a0bc
186 Risk Score

Malware Insights

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

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 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://maypoin.ru/123?utm_term=what+kind+of+oil+does+a+generac+gp5500+take PDF link annotation
    • https://kedumapeba.weebly.com/uploads/1/3/4/5/134593926/5330961.pdfIn PDF document text
    • http://guitar.su/sccm_report_office_365_client_versionsxa82c.pdfIn PDF document text
    • https://xejukosaxup.weebly.com/uploads/1/3/1/4/131437924/b466358.pdfIn PDF document text
    • http://azakalaza5.xyz/44777116278pozig.pdfIn PDF document text
    • https://tadinitalu.weebly.com/uploads/1/3/4/7/134744808/8692697.pdfIn PDF document text
    • https://cdn.sqhk.co/menekilebuz/SjcjjkC/mibizudasabax.pdfIn PDF document text
    • https://judexibegajojid.weebly.com/uploads/1/3/4/8/134885636/mupaxi_fonadanexe_baxab_laloz.pdfIn PDF document text
    • http://nogefoxezegu.22web.org/bobs_burgers_spec_script.pdfIn PDF document text
    • https://dagigokes.weebly.com/uploads/1/3/0/7/130739756/7535edbb0.pdfIn PDF document text
    • http://kebakef.iblogger.org/xosediwivujigurajunadivev.pdfIn PDF document text
    • https://vafiradas.weebly.com/uploads/1/3/3/9/133988778/903954.pdfIn PDF document text
    • http://pasojalesoled.iblogger.org/what_does_the_house_symbolize_in_the_destructors.pdfIn PDF document text
    • http://womenita.fun/everything_everything_nicola_yoona6drr.pdfIn PDF document text
    • https://bigimenuxorotel.weebly.com/uploads/1/3/4/6/134655509/batume_pebafanozoxori_parisonowezanap_vejilogu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jilabof.epizy.com/free_christmas_templates_for_word.pdfIn PDF document text
    • http://muravurut.epizy.com/23786318774.pdfIn PDF document text
    • http://xatudoxi.epizy.com/philips_avent_monitor_manual.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_off0000db8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8F 5760 bytes
SHA-256: be6e1aa97c8de907b7f1a501286fca7c4f0415fb02dd64f44bc8235a156c9dd6
font_01_sfnt_off0000ef42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF42 11136 bytes
SHA-256: 311c2f38da5273dde770a757192d415a416867d9592fbb7df2efb2d50a23b1da

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