Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfda859dbd4f6278…

MALICIOUS

PDF

68.3 KB Created: 2020-12-30 07:01:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a93c2cba32ccbd4a2e6993999c5cdaad SHA-1: 91201b04039d2a7d4b3515c3d10f3096b815601c SHA-256: dfda859dbd4f62784beca69bb88bb126713ef251034d3d1f69dc3cefbacd0a5b
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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://cctraff.ru/123?utm_term=kinetics+worksheet+for+chemistry+answers In PDF document text
    • https://besajiti.weebly.com/uploads/1/3/1/8/131856076/jivof-kofezawonipaka-pilokapuse.pdfIn PDF document text
    • https://texifafotolatip.weebly.com/uploads/1/3/4/7/134764930/monegufuz_zijojazutedaruk_towabonagobu_wepajasiwunos.pdfIn PDF document text
    • https://zovodexipelozas.weebly.com/uploads/1/3/4/4/134401167/wixoxekaxogaka-wizizuxatijajot-dunup.pdfIn PDF document text
    • https://vozutadisifik.weebly.com/uploads/1/3/1/4/131483249/6169007.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xaliwalufoguni/takis_ingredients_label.pdfIn PDF document text
    • https://s3.amazonaws.com/titugome/gregg_reference_manual_online_version.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da0f33c4-f932-4130-a880-f90fe426f09f/war_of_worlds_full_movie_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5e9f8e3-3c5b-4cfd-8500-29af2e321bdd/jeraxidunatitifubamudim.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/zepilalife.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e7a998b-f163-4a77-8cf5-b62f81679808/desktop_for_instagram_chrome_web_store.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/bike_race_games_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/service_delivery_manager_resume_template.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/is_the_center_of_mass_of_the_dumbbell_in_the_figurefigure_1_at_point_a.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b742ef5c-6ee5-43f0-ae0c-51a73583a9e2/35632411714.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_off0000c2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E0 2960 bytes
SHA-256: 3c6502e04658d985b37ed967139d4b1bb7136c1c8ff06868e6b64c17630b7d50
font_01_sfnt_off0000cd63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD63 5316 bytes
SHA-256: b0bce6025e67bc7829ecd5695aff71d99ae5109358c59dd62ee2726aa1860773
font_02_sfnt_off0000df67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF67 10712 bytes
SHA-256: fd0edaf079fdcf16b6d8d4e099a67ec3d99df6a8daa3b8a489ca77be28470617

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