Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7fee05e66a7c0fb…

MALICIOUS

PDF

123.7 KB Created: 2021-03-07 04:38:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 7b936d9c63319b80132956b0675ba5b6 SHA-1: 8915cc36daa92b757363db36872a813afc8355c2 SHA-256: b7fee05e66a7c0fb2d3f920bd2b2601ac20cabef2b91a3d45c8289850543d206
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a mass of external links, many hosted on disposable domains, suggesting a link farm designed for SEO manipulation or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or a trojan downloader. Although no scripts were explicitly extracted, the PDF structure and embedded URI heuristics point towards exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • 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://soxebez.ru/wix?keyword=persona+4+adachi+ending PDF link annotation
    • http://lodomujimujug.mywebcommunity.org/87863374299.pdfIn PDF document text
    • https://divebofa.weebly.com/uploads/1/3/4/6/134690115/munijegigamukobur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415936/normal_600c3c284419d.pdfIn PDF document text
    • http://sagedix.medianewsonline.com/72703275490.pdfIn PDF document text
    • https://kosukanawator.weebly.com/uploads/1/3/5/3/135304621/zopanemofazim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375207/normal_6044265cb6de9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383924/normal_5ffd54a0634bd.pdfIn PDF document text
    • https://pijolonaponezu.weebly.com/uploads/1/3/4/8/134879261/efcccb47f4ab1c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473049/normal_5ff3aca7e90c8.pdfIn PDF document text
    • http://fumexijana.getenjoyment.net/74773214020.pdfIn PDF document text
    • https://majuxakitififez.weebly.com/uploads/1/3/0/7/130738909/fijitupava.pdfIn PDF document text
    • https://repepojopojak.weebly.com/uploads/1/3/5/9/135970902/ximati.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412902/normal_603d8cb006097.pdfIn PDF document text
    • https://temizugejifo.weebly.com/uploads/1/3/1/3/131384470/giger.pdfIn PDF document text
    • https://jakakatis.weebly.com/uploads/1/3/5/3/135323185/2790782.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/0796a746-1c1c-4569-978e-12ddb6284b79/what_does_f20_mean_on_a_washer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0846722c-81a6-4ff2-b9b8-d5525766547f/life_fitness_x15_elliptical_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48542ccd-d825-4614-b41e-838790164ef2/change_oil_on_campbell_hausfeld_compressor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7f17eb1-49a5-4796-a75c-780770fd2bb4/how_to_study_in_college_walter_pauk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/203f3a71-254b-4b23-8310-e043787e8820/what_is_free_oxygen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef4a9430-7814-4335-9ce2-57901970335e/donate_clothes_near_me_today.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38923382-d5fa-4b61-bfce-56b13b9abd10/echo_dot_4th_generation_manual_free_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019c06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C06 4352 bytes
SHA-256: ded5c3ba736bfa6f5c40ea21f84870f6087816057c2d7548de9dc0f64fd7dfcc
font_01_sfnt_off0001ab8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB8D 5260 bytes
SHA-256: b502d21a9aa8ea824688e8cdc1ff8e3d1cef47c7467dcccb93ef98c3fdbbc181
font_02_sfnt_off0001bd6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD6B 10504 bytes
SHA-256: 683a85cb55a8c26a8c9abbf3f22ebe7f5a51860df587ef1da2c6d492f42487c9