Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e1f5055900effe4…

MALICIOUS

PDF

78.4 KB Created: 2021-03-05 23:54:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ec781d51b3c21d4794701876280a9fe6 SHA-1: ce4cf5c1dd8b661caa1083faf5e0ba19403701f1 SHA-256: 4e1f5055900effe4cb936e12a5a4b7f40bda62edb777fddb737f799a4d4ed1b0
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed for phishing or scamming. The embedded URLs, such as 'https://kuzutuzo.ru/strik?utm_term=washington+dc+dulles+international+airport+hotels', are likely part of this lure to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/strik?utm_term=washington+dc+dulles+international+airport+hotels PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415740/normal_60105989cf639.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489977/normal_5fd1fc1d01767.pdfIn PDF document text
    • https://nusepetuvake.weebly.com/uploads/1/3/3/9/133997573/setep.pdfIn PDF document text
    • https://xasezufud.weebly.com/uploads/1/3/4/0/134016907/6568067.pdfIn PDF document text
    • https://vozokeku.weebly.com/uploads/1/3/1/8/131857213/gutoxufij_kaxanizurigop_nudonuseda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459057/normal_5fd8eb060c85b.pdfIn PDF document text
    • http://supernefritroller.xyz/doll_house_furniture_amazonutdt5.pdfIn PDF document text
    • http://rollernefrit.xyz/58099959307ndf8b.pdfIn PDF document text
    • https://wuzafonufiza.weebly.com/uploads/1/3/4/3/134341979/7e238b16.pdfIn PDF document text
    • http://joblanc.xyz/koxadamesolenot17vo.pdfIn PDF document text
    • https://cdn.sqhk.co/zebenane/bojfePc/run_meme_soundboard.pdfIn PDF document text
    • https://tuvepovuno.weebly.com/uploads/1/3/3/9/133997374/modow.pdfIn PDF document text
    • https://cdn.sqhk.co/jiguluzufuwa/yihHhPf/lijawugotunufib.pdfIn PDF document text
    • https://pemiroma.weebly.com/uploads/1/3/1/3/131383733/rejewenazefamuxum.pdfIn PDF document text
    • https://sujarazigis.weebly.com/uploads/1/3/0/8/130813042/52cb44fd.pdfIn PDF document text
    • https://wiguvebilef.weebly.com/uploads/1/3/5/3/135389097/viwitigizi.pdfIn PDF document text
    • https://cdn.sqhk.co/jarixizotib/4ejdhiU/weekend_mechanic_apprenticeship.pdfIn PDF document text
    • https://cdn.sqhk.co/tatidukigag/dwjgjhe/39911465957.pdfIn PDF document text
    • https://lizodeva.weebly.com/uploads/1/3/5/3/135342900/janebojebep.pdfIn PDF document text
    • https://cdn.sqhk.co/zovitamojim/ih8e0ib/levab.pdfIn PDF document text
    • https://sazejibapox.weebly.com/uploads/1/3/4/8/134863873/fopesawexizom-vimuxo-linilope-tufobaniriji.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_off0000f680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF680 5348 bytes
SHA-256: eeb0dd4de707be5d15582ce431e2ba8281d4cf281863daba2989e259f553837d
font_01_sfnt_off000108b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B8 10360 bytes
SHA-256: c74458396c4ca39abb1bff488cc4e972871b26466a22977a38f1dcf5403daf85