Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a4e0923e299c111…

MALICIOUS

PDF

79.9 KB Created: 2021-05-12 16:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 4885ab2a00d8860f3c95559b6b3aa2e8 SHA-1: e2696f7d04997753a06dcf5d74215db59b4490e9 SHA-256: 4a4e0923e299c111f0989c7933e4796945923f3127e2ce4636c8966edd086c75
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing trojan. The presence of external URIs and the overall structure point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/strik?utm_term=financial+statement+analysis+and+security+valuation+pdf PDF link annotation
    • https://cdn.sqhk.co/rafumufo/j2ihhaV/guess_the_character_block_quiz_answers.pdfIn PDF document text
    • http://dunetetemob.22web.org/tuvuziromeralexat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483864/normal_6020750d9b207.pdfIn PDF document text
    • http://witaxolexigabi.mywebcommunity.org/brick_masonry_design.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490380/normal_604344187868b.pdfIn PDF document text
    • http://nafarami.medianewsonline.com/pagubimorebosugeregaga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370051/normal_605bea78e1252.pdfIn PDF document text
    • https://cdn.sqhk.co/liminekaj/ieRjbp7/77220288152.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420476/normal_602d0ea143427.pdfIn PDF document text
    • http://fisuwodep.22web.org/5511112829.pdfIn PDF document text
    • http://xugutolajon.22web.org/foxit_to_word_converter_with_crack.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://ruleruz.epizy.com/naxabuwatolopigugovademu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a71e97a-5ae0-41c5-9c82-ad3c460d9cac/conflict_resolution_worksheets_for_students.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/911a2202-0c85-458f-a615-f9e1a4685c5d/88269962701.pdfIn PDF document text
    • http://varirojemixu.myartsonline.com/81913527147.pdfIn PDF document text
    • http://neketepa.myartsonline.com/47729717426.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abb1e7f9-db54-43dd-b6d1-6216c2c4ad12/vetosajigaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9e50866-c017-44df-891e-03b35fb24e12/bobebumuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f8ebe99-8462-46ff-b881-5535662bbd21/digital_communications_associate_salary.pdfIn PDF document text
    • http://jenotuxeje.onlinewebshop.net/61735330446.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_off0000ed52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED52 5300 bytes
SHA-256: bcb05f7c5b62323770cd5b6b028afe8ebae83211962317ee1d79655daab0d4f8
font_01_sfnt_off0000ff42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF42 10688 bytes
SHA-256: 76eee3ce1c1f9a13674a6dc9cf4899e24e902a1671df47f352da70cc4f93ea34
font_02_sfnt_off000123a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A8 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3