Malicious PDF — malware analysis report

Static analysis result for SHA-256 d845d38ee4b3c9d3…

MALICIOUS

PDF

76.1 KB Created: 2021-03-12 05:39:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 2e0d5b3c6250858056b07536ed07c40e SHA-1: 5588b07f8cb1fb23dbd07d28825860977b9df69d SHA-256: d845d38ee4b3c9d3456c111c386a90b906b68b35f6df439a229495de8cec9502
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic PDF_SEO_LINK_FARM indicates a link farm strategy, likely to distribute malware or conduct phishing. While no scripts were explicitly extracted, the nature of the embedded links and the ClamAV detection suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=primarygames.com+fire+boy+and+water+girl In PDF document text
    • http://dompodklyuch.com/varozolekufiwo0wb3p.pdfIn PDF document text
    • https://cdn.sqhk.co/pipujevi/WhfghYM/fill_in_holes_in_wall_with_toothpaste.pdfIn PDF document text
    • https://cdn.sqhk.co/wireriduwude/MZhbjch/simcity_buildit_pc_download_ita.pdfIn PDF document text
    • https://cdn.sqhk.co/ropikenetu/GifhjCk/chicken_run_full_cast_imdb.pdfIn PDF document text
    • http://podcard2020.site/71882430573d2rnm.pdfIn PDF document text
    • http://ing-cliente.com/the_lord_of_the_rings_the_return_of_the_king_gamecubeneoi1.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/1aa2e0a9-440c-4683-b93b-4ad2f090a795/petsafe_pif_300_reviews.pdfIn PDF document text
    • https://6680615c-3592-42a6-94f3-b98e474b5330.filesusr.com/ugd/252546_50663e7a0f984efc95b519cc380f331b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/mutikofix.pdfIn PDF document text
    • https://s3.amazonaws.com/golepe/93987084185.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifawuvawot/suweloxixek.pdfIn PDF document text
    • https://f95b5726-9955-4dff-afd2-80a4c314a5a0.filesusr.com/ugd/b0b521_4128248fb57b4c688fa64db91821b606.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/24710420883.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a9db31f-4449-421e-9b9e-344aef40722c/the_power_of_a_positive_no_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/90141646860.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07901ccb-47d3-4f65-8cc1-80870eff07b2/luluxuvurog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/380593f6-c0b1-4767-b7e1-579fccc45634/78566836432.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_off0000ed92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED92 5708 bytes
SHA-256: 0df2f6fcc4be2017609fe694b0468c032b8b7900857e070143bfa7a05aeee0bd
font_01_sfnt_off0001010b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010B 10040 bytes
SHA-256: 7168a92765c40f384bb834d6b194f8a16bf40f374d1e0cadaf127a33a00acfd0

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