Malicious PDF — malware analysis report

Static analysis result for SHA-256 bafc6455a088be03…

MALICIOUS

PDF

77.9 KB Created: 2021-05-06 03:36:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 766ada789d09a8c5297d66a96ebcfbe3 SHA-1: 84bff3b875c181fb4ee7fd58e8bddeceabca0330 SHA-256: bafc6455a088be03ba1e7718f7b7334335695fd9b018aad4ebac62d7a3f1c863
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 0.9993

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://botokaw.ru/strik?utm_term=best+microwave+convection+oven+for+rv PDF link annotation
    • https://xenesadu.weebly.com/uploads/1/3/0/7/130739949/2466254.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457570/normal_600468fc44684.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401519/normal_6026f94156b2f.pdfIn PDF document text
    • https://gujibimusexuwub.weebly.com/uploads/1/3/4/0/134042380/7092631.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411481/normal_6034089fb2e76.pdfIn PDF document text
    • http://rating-bookmaker.ru/animals_and_their_young_ones_worksheetmxlcg.pdfIn PDF document text
    • https://tunimesepet.weebly.com/uploads/1/3/1/4/131455680/b89d0aada6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426073/normal_5fd09f15cfb7b.pdfIn PDF document text
    • http://temppicture.xyz/top_5_sales_interview_questionsjzr6m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384839/normal_6041ce085ed16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499317/normal_60254753ab663.pdfIn PDF document text
    • https://bipixexomalexu.weebly.com/uploads/1/3/4/3/134349320/koxogijowurari.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472484/normal_600931ba66643.pdfIn PDF document text
    • http://saudiautoinsurance.com/what_does_the_word_darling_mean_in_spanishnhra6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401697/normal_6027e30fa75d0.pdfIn PDF document text
    • https://zedowegekinusil.weebly.com/uploads/1/3/3/9/133997302/8970e8f4c131ba1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422620/normal_60351cc85e338.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392660/normal_60121895b5363.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://witolav.epizy.com/transformers_g1_arcee_wiki.pdfIn PDF document text
    • http://wuzorijo.rf.gd/abc_coloring_pages_for_kindergarten.pdfIn PDF document text
    • http://texuxirim.epizy.com/zifivukuwolojovivujefedub.pdfIn PDF document text
    • http://mebapuperepomuv.rf.gd/wajokewodirozirukedi.pdfIn PDF document text
    • http://gisuvax.epizy.com/78557433821.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_off0000f1e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E5 5196 bytes
SHA-256: e7d5adf11931c8cd242f928fde4476ddba4143a16bbe2a7f1eb95812094c780d
font_01_sfnt_off00010397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10397 11288 bytes
SHA-256: 3ccba0c8cdc9476240dde43804df51411b3fd3c41f1f2e938b6f61915e54a7f1