Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fbef8b3a025b167…

MALICIOUS

PDF

71.5 KB Created: 2021-02-27 09:57:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: db5d36ab23a70d6ce46be1d21a23c321 SHA-1: 186738d5c4510d69bd16f8bd509ad1708af8339c SHA-256: 1fbef8b3a025b1670a65228dc781d87ba7086b9ee837be7bc5a2f042af72e489
186 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://midufefew.ru/123?utm_term=what+is+the+meaning+of+visual+arts PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451950/normal_6012b179244a4.pdfIn PDF document text
    • https://sesuwulot.weebly.com/uploads/1/3/1/4/131438847/6070787.pdfIn PDF document text
    • https://kenufipafalenar.weebly.com/uploads/1/3/4/6/134616414/4c13a3b0f7f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447434/normal_5ffb08c3bec01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453098/normal_601e514234a1f.pdfIn PDF document text
    • https://titanukudolilip.weebly.com/uploads/1/3/6/0/136082060/tapusifovuxab_bowawonixosew_xosirekebo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408983/normal_6028ae2399c9d.pdfIn PDF document text
    • https://firedilem.weebly.com/uploads/1/3/1/4/131407958/256cc7808.pdfIn PDF document text
    • https://piwutevuxave.weebly.com/uploads/1/3/4/8/134891910/liwatof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478688/normal_601f2eff34ab8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465267/normal_5ffc93ed75a1c.pdfIn PDF document text
    • https://doxazefeseremef.weebly.com/uploads/1/3/4/7/134764644/lakizemulirugevef.pdfIn PDF document text
    • https://dowusezawidi.weebly.com/uploads/1/3/3/9/133997386/52904d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476272/normal_5fe27d7be5c3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366958/normal_602ebbb3d0d1e.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/zerejibixupav/frederick_jackson_turner_frontier_thesis_excerpt.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/65468293718.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/68422930511.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_off0000daa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA8 5252 bytes
SHA-256: a897bb45c75aacba07838953baf52d01d88c0c31b15cc421886925f9d09ce8be
font_01_sfnt_off0000ec71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC71 10752 bytes
SHA-256: d9522c873f866280e22a699406b7f23295fc0d564f21678210919044ac6cf32b