Malicious PDF — malware analysis report

Static analysis result for SHA-256 13f8e17ba65e3f99…

MALICIOUS

PDF

78.6 KB Created: 2021-06-03 14:21:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d125ec5766a6eac5eb03ac1fd3ab6da3 SHA-1: 7d6d2959a1886d47bfe1c9111184b17cdaba1ae4 SHA-256: 13f8e17ba65e3f9948a13c02fb7bb37b84d1f92e448fabb227fc7dc2db895eee
186 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links to external websites, many hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a lure to external malicious content, likely for phishing or malware distribution.

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://philabc.ru/pbw?utm_term=meme+podemos+ser+amigos+con+derechos PDF link annotation
    • https://takewozijofu.weebly.com/uploads/1/3/2/6/132682119/makesiti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502178/normal_60623e28299fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369664/normal_5ff5857f8e309.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444369/normal_600d1a8713b7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453102/normal_60277a4364e67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412593/normal_605b0fb885f49.pdfIn PDF document text
    • https://jipafopabos.weebly.com/uploads/1/3/3/9/133986828/nunawabejapodu.pdfIn PDF document text
    • https://rezepurobej.weebly.com/uploads/1/3/5/3/135327696/93179bfe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500882/normal_5ff9a6a925b45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380525/normal_60414365d27a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369773/normal_604b865e9aa03.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4401723/normal_60b664e7e9c8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389824/normal_5fd92f9781d69.pdfIn PDF document text
    • https://lutividagij.weebly.com/uploads/1/3/4/8/134896544/7882526.pdfIn PDF document text
    • https://jerepukiw.weebly.com/uploads/1/3/2/6/132681878/gukabuvu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393209/normal_5fdc324faafc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487918/normal_6056ee8dc6759.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466413/normal_604ae4102a4e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422373/normal_6033f223a46de.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fosirodovo.pbworks.com/f/zonerusarugemewir.pdfIn PDF document text
    • http://mazibudikor.pbworks.com/w/file/fetch/144543135/xomujubotopazelatelegaka.pdfIn PDF document text
    • http://bovojigu.pbworks.com/w/file/fetch/144418572/hollywood_hindi_dubbed_movies_watch_online_sites.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_off0000f18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18E 5460 bytes
SHA-256: 27c8e700d3762648036e1ef3025e313f4bd72b0b7adefd60cd437c2e3df32de5
font_01_sfnt_off00010404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10404 12140 bytes
SHA-256: a42345782ab98aeaa198e81eeb3ae9a4b12e6e238197f9d0951f2d719fef8293