Malicious PDF — malware analysis report

Static analysis result for SHA-256 4155fae17d1e2e0d…

MALICIOUS

PDF

77.9 KB Created: 2021-01-18 21:20:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c0f26dca4ab4a326bb9cffeb07d90445 SHA-1: 458fc2b52da5aa6c54c05d9a2043b5173cb53655 SHA-256: 4155fae17d1e2e0d0307e2f01159b9d2f17989003deef9b8e75c15d794ed2735
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a link farm on disposable hosting and a high ML classifier score. The embedded URLs and the nature of the PDF suggest it is designed to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution attempt.

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://crophysi.ru/123?utm_term=bile+esculin+agar+plate PDF link annotation
    • https://site-1196465.mozfiles.com/files/1196465/chores_for_8_year_olds.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423780/normal_6001025806aa6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386852/normal_5fae1d963c5f8.pdfIn PDF document text
    • https://nivenenururela.weebly.com/uploads/1/3/4/5/134585639/9274543.pdfIn PDF document text
    • https://site-1166068.mozfiles.com/files/1166068/bubebakadolinigirozokajo.pdfIn PDF document text
    • https://site-1238130.mozfiles.com/files/1238130/ce_technical_file_example.pdfIn PDF document text
    • https://gikigafe.weebly.com/uploads/1/3/4/4/134440869/zujozalagajolefezudo.pdfIn PDF document text
    • http://rakuxijewimafud.22web.org/qr_scan_barcode_apk.pdfIn PDF document text
    • https://mevamakokuvafas.weebly.com/uploads/1/3/4/0/134040887/c98f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374685/normal_5f8a8d3c0500a.pdfIn PDF document text
    • https://fajizaxaro.weebly.com/uploads/1/3/1/3/131381717/gimolibugipo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lelexuxifu.epizy.com/47588903445.pdfIn PDF document text
    • http://jefebewo.epizy.com/ballad_of_serenity.pdfIn PDF document text
    • http://vufigenetusanu.epizy.com/stakeholder_management_communication_plan_template.pdfIn PDF document text
    • http://tukufewusi.epizy.com/degree_of_comparison_exercises_with_answers.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD2 5148 bytes
SHA-256: 5cb74635ab67bc4064eb1377dbd4ddd51db53c9834a831c8c8922cb3bfb2663a
font_01_sfnt_off0000ef6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6A 11320 bytes
SHA-256: a937d0a00c54de5fc71361ddbc6a764d6dcf28befd1911c84cd87b2ff8753796
font_02_sfnt_off000115f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F0 16088 bytes
SHA-256: ba49a359edda73fb432b2118eee43e8681603f6c6f845ef214af08c3a95321db

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