Malicious PDF — malware analysis report

Static analysis result for SHA-256 20390ac3f5dcf580…

MALICIOUS

PDF

81.7 KB Created: 2021-03-06 06:41:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: a7e99306624a078efbf6e05a5fc7562b SHA-1: 5f64cb57a961e09fa8f7f1eef6eeca2c48974de7 SHA-256: 20390ac3f5dcf5802591204db1807c168359362c8137b90046e29b33867e77e7
126 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a phishing campaign, leveraging a link farm strategy to distribute malicious content. The presence of numerous URLs pointing to disposable hosting and domains associated with link farms, combined with a high ML classifier score and ClamAV detection, strongly indicates malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful sites, likely for further payload delivery or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://vilenefex.ru/123?utm_term=the+complete+novels+of+sherlock+holmes+pdf PDF link annotation
    • http://verifiedbadge-lnstagram.com/15469965588oey1y.pdfIn PDF document text
    • https://funapimezu.weebly.com/uploads/1/3/1/0/131070883/bae438005579.pdfIn PDF document text
    • https://sarutofujatazix.weebly.com/uploads/1/3/4/5/134584212/fidigekab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376103/normal_5ff65bce0390f.pdfIn PDF document text
    • http://ditoterelutas.sportsontheweb.net/nixobikodiko.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483839/normal_5fe407a5d748f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414677/normal_601e5e653c519.pdfIn PDF document text
    • http://josumewemuzob.getenjoyment.net/11959156739.pdfIn PDF document text
    • https://ditoleruv.weebly.com/uploads/1/3/5/3/135345680/cd3474444ea00.pdfIn PDF document text
    • http://winoorama.fun/tipos_de_archivos_y_sus_conceptos5puln.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378623/normal_6010f09d73d90.pdfIn PDF document text
    • https://cdn.sqhk.co/petawelesup/7MhihgG/visual_studio_code_crash_course_2019.pdfIn PDF document text
    • https://diwesosun.weebly.com/uploads/1/3/2/6/132695938/jutup.pdfIn PDF document text
    • https://cdn.sqhk.co/zupololano/rhjgiii/44139502130.pdfIn PDF document text
    • http://vozivovog.scienceontheweb.net/81255448597.pdfIn PDF document text
    • https://cdn.sqhk.co/sipobufiw/afRujgm/kulutomogani.pdfIn PDF document text
    • http://dimifepovez.22web.org/zosefiboziwupapugisowe.pdfIn PDF document text
    • http://50offshop.info/player_guide_for_unknown_battlegrounds_pcf8rwb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465145/normal_601a08c9058e1.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/is_homework_beneficial_for_students.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://faruvesisok.rf.gd/state_employees_credit_union_close_to_me.pdfIn PDF document text
    • http://xakagigoneliv.myartsonline.com/project_management_software_for_mac_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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B4 5256 bytes
SHA-256: 8d0154a34d38631726e609adff3fb5269fa9116f0a2cd3518c8cd36bcde641d9
font_01_sfnt_off00011274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11274 10680 bytes
SHA-256: 76939e9a5b757a56542910a98ea6dfe17630e2512b3ba8c5843b8f1156c1d7a6