Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae4d4a780950f959…

MALICIOUS

PDF

78.6 KB Created: 2021-06-06 16:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b10ddc68b3fad065e296555d9dba3862 SHA-1: d0669740eea31ae65c2dc0856d28daf8789c602e SHA-256: ae4d4a780950f959d8ae803fbdf942cc6b3368ac9e580133be563980bcee9d64
194 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicative of a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm behavior align with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://synerhu.ru/pbw?utm_term=diffusion+gizmo+answer+key PDF link annotation
    • https://tugagifozige.weebly.com/uploads/1/3/4/2/134265986/9173116.pdfIn PDF document text
    • https://xorexataziz.weebly.com/uploads/1/3/4/4/134496469/7230337.pdfIn PDF document text
    • https://nofogiso.weebly.com/uploads/1/3/1/3/131398128/nedapaxezoxixem-fibufudedep.pdfIn PDF document text
    • https://tasunukalen.weebly.com/uploads/1/3/4/8/134888382/2479619.pdfIn PDF document text
    • https://ratesikumetu.weebly.com/uploads/1/3/1/1/131163578/gugotizewegode.pdfIn PDF document text
    • https://ragurinibobuma.weebly.com/uploads/1/3/3/9/133986244/dawulesogopad.pdfIn PDF document text
    • https://vepegusekukoj.weebly.com/uploads/1/3/4/4/134470637/918b12030a6592.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489607/normal_5fc770dc52d63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465142/normal_606c23bebaa82.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414339/normal_5ff3e82d68ab2.pdfIn PDF document text
    • https://lokesikaneweb.weebly.com/uploads/1/3/1/4/131437695/39ee8758278a829.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bevojoluvu.pbworks.com/w/file/fetch/144473298/17021561129.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f8cb9a0-463d-4152-96a9-c44b06fe0fa1/69487959995.pdfIn PDF document text
    • http://kolelulu.pbworks.com/w/file/fetch/144562452/how_can_limiting_reactant_excess_reactant_and_percent_yield_help_manufacturing_companies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ff739a1-59e0-4806-b4e7-26ed242528f7/lesson_6.7_practice_a_geometry_answers_pages_372-380.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e505f59-2f58-47fa-9173-f6afc9b7db41/bissell_spot_cleaner_pro_manual.pdfIn PDF document text
    • http://dekokos.pbworks.com/f/witcher_books_the_last_wish.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3888acb3-c4f9-4a60-988d-d47e8fcc7c64/dream_of_blood_gums_and_teeth_falling_out.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_off0000f728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF728 5364 bytes
SHA-256: 0dbf9a8b64d90194fbe6e5c3a5242b39b6e0850978d0eafe7e8710f6177e212d
font_01_sfnt_off0001097f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097F 10492 bytes
SHA-256: 3b8e71cab6b30969ec262ae8b7d2a8912e1f7ea9f999945796e6f05935b50a40