Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe87d5e90e06a65f…

MALICIOUS

PDF

77.1 KB Created: 2021-06-06 21:03:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 28a00d8030e792b13d4a2b2bfd57bf05 SHA-1: 33efe414ce8bd6502f28325aabe35a8e60913afe SHA-256: fe87d5e90e06a65f9bc02f695236e997d7f839bb6b01b62ff82c746fb0b47e32
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, with a deceptive title related to 'African Christian theology'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or phishing. While no scripts were explicitly extracted, the PDF structure and URI heuristics suggest it's designed to redirect users to potentially harmful sites.

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://golowaki.ru/123?utm_term=african+christian+theology+pdf PDF link annotation
    • https://fifitusaperofij.weebly.com/uploads/1/3/4/6/134605769/2412362.pdfIn PDF document text
    • https://xizunobalik.weebly.com/uploads/1/3/0/7/130739811/pubunumono-nojuve.pdfIn PDF document text
    • https://dolilufaxeni.weebly.com/uploads/1/3/2/6/132683246/c452c0335d.pdfIn PDF document text
    • https://mixuvuweti.weebly.com/uploads/1/3/1/4/131483588/wixopuvalipo.pdfIn PDF document text
    • https://kuxijixa.weebly.com/uploads/1/3/4/8/134856984/zibobanalaru_lifuruv_renokivetugozak.pdfIn PDF document text
    • https://zizojatemizowen.weebly.com/uploads/1/3/4/0/134016780/vorogefifalo.pdfIn PDF document text
    • https://vafumavuforowa.weebly.com/uploads/1/3/4/4/134489815/7000184.pdfIn PDF document text
    • https://jiresuzava.weebly.com/uploads/1/3/4/7/134706808/zugenegewupux.pdfIn PDF document text
    • https://putepinezuvoko.weebly.com/uploads/1/3/1/8/131856998/d15d271f59.pdfIn PDF document text
    • https://kenomixu.weebly.com/uploads/1/3/0/9/130969587/tapalo-levewedegame-vitutojirox-norizegidifuv.pdfIn PDF document text
    • https://mezemefi.weebly.com/uploads/1/3/1/3/131384279/6215211.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/34cd7bb9-af02-4b75-bbb9-2b1a0cb2d8b6/what_channel_is_bounce_on_xfinity_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00e92fb9-38d6-41cb-a2c7-a6300aabf287/92234073641.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94a26dbe-8aa2-4429-b23d-d057cf9b1585/what_color_wallet_is_lucky_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c3a1759-f381-45e6-aea3-84b9ad82f65c/nivowozufojifuxeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0837d50e-e751-490c-9c3a-b79fae2c48e2/xiruroteronoruxalomivado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed775daa-fe6e-4d6b-a255-2edd0ac9a279/why_is_h2so4_a_stronger_acid_than_h3po4.pdfIn PDF document text
    • http://tagexoba.pbworks.com/f/90348003042.pdfIn PDF document text
    • http://fatakalewene.pbworks.com/f/86494546803.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74e03291-ed5b-4a81-b38d-f8e160d917b2/dopurikavofazajasivug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a8c1994-018d-4aef-b8ee-dcda52e9a76a/old_school_hip_hop_songs_clean.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_off0000ef76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF76 5508 bytes
SHA-256: 87cfa8222cad5d1b221097bb57845d85114676380b07c6cb44373718dd5bfa38
font_01_sfnt_off00010238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10238 10844 bytes
SHA-256: 87a771e23e4bac7d4ccfc3ec594ce8dc40827eefe1fa3133941d2c341466e4e9