Malicious PDF — malware analysis report

Static analysis result for SHA-256 f632057bab67daf0…

MALICIOUS

PDF

78.6 KB Created: 2021-03-15 23:28:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e2bdb2621a262b31e76afd46b9d18f0e SHA-1: 4997a40a8dfab0636edb5be49a90fb4c6cd87c41 SHA-256: f632057bab67daf058cf3c763195255674a2e8cbf275f0c1c357c44d2884e09b
244 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. It also contains a large number of embedded links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://yafferge.ru/wix?keyword=falcon+4.0+allied+force In PDF document text
    • https://static.s123-cdn-static.com/uploads/4414166/normal_5fcef9cfe6d39.pdfIn PDF document text
    • https://jurivulanikep.weebly.com/uploads/1/3/4/5/134525456/6619786.pdfIn PDF document text
    • http://idealica-italiaufficiale.site/35219627607x9xc7.pdfIn PDF document text
    • https://pewarefat.weebly.com/uploads/1/3/4/3/134361746/jimitimek.pdfIn PDF document text
    • http://ses-sanobrabotka.ru/72477388411i821d.pdfIn PDF document text
    • http://masalev.ru/what_is_the_best_4k_55_inch_tv4bhnu.pdfIn PDF document text
    • http://detonic-ufficiale.website/spider_man_2099_comic_19927ad1p.pdfIn PDF document text
    • https://dibevapanowodi.weebly.com/uploads/1/3/0/7/130776811/6bcca20c6fb3f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492575/normal_5ffb30e4ca432.pdfIn PDF document text
    • https://regamozinog.weebly.com/uploads/1/3/0/9/130969170/xubititarexibev_naluronab_wenobitivaxofov_zakonagi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403940/normal_603a7b19f383f.pdfIn PDF document text
    • http://tryici.xyz/resistance_3_trophies_guidefr7hf.pdfIn PDF document text
    • http://reabook.online/solving_quadratic_equations_by_factorising_answers22h51.pdfIn PDF document text
    • http://lerob.info/jesapozezajurase0nc.pdfIn PDF document text
    • https://pawuxadatunu.weebly.com/uploads/1/3/4/2/134266652/d3ecc8c81cb52f.pdfIn PDF document text
    • https://wedodoto.weebly.com/uploads/1/3/5/9/135993452/bitebiporeli.pdfIn PDF document text
    • https://fotovotujipibar.weebly.com/uploads/1/3/4/2/134267097/8556726.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371247/normal_602577e07089c.pdfIn PDF document text
    • http://nazhivy.net/42606132999jtypc.pdfIn PDF document text
    • http://tertov.xyz/zavadugenurelipevunedetiz73in0.pdfIn PDF document text
    • https://jojapunopumaj.weebly.com/uploads/1/3/1/4/131482926/mokujena_bevunexiw_vetobanosigid_lurasanir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472479/normal_6043bfb6e91b7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF619 5052 bytes
SHA-256: d068578df40d4f9723252d35f62824137cd7d5a570e94da585bc2dd26997958f
font_01_sfnt_off00010764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10764 11120 bytes
SHA-256: ac9bf66aef5ffe256568914e4d69be878f419ee4aba6b78a04a39da4da0d424c