Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd553bd4f934ddf2…

MALICIOUS

PDF

75.7 KB Created: 2021-05-23 05:03:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: fa0e385d3b56a5b565107f8b9003cf0c SHA-1: 553222c23a77cb797539dcf07155166b9b8dfede SHA-256: dd553bd4f934ddf26ca35e81cf418cecaee928aa697a1cdf655841a82b86a108
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains heuristics indicating it is a phishing document and a link farm, with a high ML classifier score and ClamAV detection. The embedded content, though heavily obfuscated, suggests an attempt to trick users into downloading software. The primary IOC is a URL that appears to be part of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 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.
  • 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/strik?utm_term=adobe+pdf+reader+for+windows+10+professional+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4394079/normal_6013246c5d8ea.pdfIn PDF document text
    • https://mewifukemi.weebly.com/uploads/1/3/4/7/134764424/f4afe06062fa23d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492915/normal_604eb2dba494b.pdfIn PDF document text
    • https://zunexoxefa.weebly.com/uploads/1/3/5/3/135340588/mujewa.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/0dd1c5cc-c933-4dbe-8322-2f0abed7e6b4/what_is_les_miserables_staged_concert.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc21fe54-4b89-4bd2-a77e-25118d4efca1/the_adventures_of_huckleberry_finn_movie_1993_cast.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/bba_full_form_tamil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed73d1be-e322-485a-935b-e30701f1d624/libopu.pdfIn PDF document text
    • https://s3.amazonaws.com/mokamoba/zisawisowogaranow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bf87f32-dcb2-46ff-8de4-716fc0f03afe/xowaresizeduxovum.pdfIn PDF document text
    • https://s3.amazonaws.com/dinilederu/61000607229.pdfIn PDF document text
    • https://s3.amazonaws.com/dipafuxe/anaphylaxis_management_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/get_your_guide_supplier_administration.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/zeronijorovok.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/justification_report_excel_generation_utility.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6708b18-35fc-42b8-9486-8fc7604c538f/yamaha_sound_reinforcement_handbook_amazon.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/redujaxekidotuviwufit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a947da8-5793-4507-9275-e9d7e2155fce/where_rainbow_ends_summary.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_off0000ebe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE5 5448 bytes
SHA-256: 71cce70308adb824a8f4d9aa3b45cc79221137ca4fd9477c76fb6e260b2c769e
font_01_sfnt_off0000fe8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8F 10200 bytes
SHA-256: 1c932fbc2028ddce6b716e673b9b9e783677e4aa3279184a593dfe139d8f419f

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