Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6ebc7b98dc1d71c…

MALICIOUS

PDF

75.4 KB Created: 2021-06-12 08:19:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 274d43de7865719c9e981a4cb8376c17 SHA-1: c38ea153003b5f0a1d5229807006daff3c9bc888 SHA-256: b6ebc7b98dc1d71c8d8b27c6b946728feb3824824a22a1b39e7464861dea330c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document's purpose is to redirect users to potentially harmful external sites.

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://nipisod.ru/123?utm_term=cambridge+dictionary+android+app+free PDF link annotation
    • https://sekoxakukajafal.weebly.com/uploads/1/3/4/7/134705290/eff364134b3306.pdfIn PDF document text
    • https://vipamabukaxeban.weebly.com/uploads/1/3/0/8/130874648/4491001.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384029/normal_601536b458d88.pdfIn PDF document text
    • https://wadidomewagu.weebly.com/uploads/1/3/2/6/132681938/e96d6f934.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420448/normal_60026258c245b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380707/normal_60152dc90e004.pdfIn PDF document text
    • https://fikijumosoliz.weebly.com/uploads/1/3/5/4/135400707/458d7cfb473.pdfIn PDF document text
    • https://zuzamogofo.weebly.com/uploads/1/3/1/3/131383802/b053d8d9e54fd47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4528915/normal_600b0dcd47ab5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418987/normal_60477842393b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417813/normal_60468e2b1159f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456369/normal_603be065e7663.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482854/normal_604dde77b93d0.pdfIn PDF document text
    • https://bamiwesuwo.weebly.com/uploads/1/3/5/3/135390748/nafesekipiresuvefuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445101/normal_600f77635ca28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480383/normal_6022bc5c733c9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mapijakemifo.pbworks.com/w/file/fetch/144467457/horse_riding_tales_not_loading.pdfIn PDF document text
    • http://bevosox.pbworks.com/f/zuremilekepidalinuzumali.pdfIn PDF document text
    • http://fujiserefi.pbworks.com/f/download_tantan_vip_mod_apk_terbaru_2021.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_off0000e750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE750 5412 bytes
SHA-256: 11fe4b6e938fc8ee9571b74ebafe51197b2111cdeb54ed618288b9f8daa5eac0
font_01_sfnt_off0000f9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A5 11576 bytes
SHA-256: c05612a728352a2abc78658914dd2691a5af59ad562ba2c141a0ad8a27768666

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