Malicious PDF — malware analysis report

Static analysis result for SHA-256 8311d8f5f7f83f9a…

MALICIOUS

PDF

85.3 KB Created: 2021-01-30 18:03:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c68639bd4c2793a346a45495fabc65c6 SHA-1: af9b041fde5389a4c2d589c75e7a23243b7ff619 SHA-256: 8311d8f5f7f83f9af3803d7abc9fae1cd667a700d8401ddef8cc5774f84a2b65
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and exhibiting link farm characteristics, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful 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://maypoin.ru/123?utm_term=good+amharic+books+welcome PDF link annotation
    • http://trickyturkey.com/steam_inventory_calculator_cs_go2ae5n.pdfIn PDF document text
    • https://cdn.sqhk.co/podidiwi/heFidje/69698111853.pdfIn PDF document text
    • https://cdn.sqhk.co/naludibeg/klUhfjf/pic_pac_taylor_blvd_weekly_ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470211/normal_5fd0d6cab9f13.pdfIn PDF document text
    • https://cdn.sqhk.co/tumosirewuw/Gh1Nhih/three_kingdoms_epic_war_heroes.pdfIn PDF document text
    • http://moperala.iblogger.org/fonezabu.pdfIn PDF document text
    • http://acupofjacob.com/246296248pkovo.pdfIn PDF document text
    • http://zuwujamoruwipam.22web.org/xetobakopaniwafoxozuki.pdfIn PDF document text
    • http://dnepr24.info/actuarial_mathematics_textbookawsa1.pdfIn PDF document text
    • https://cdn.sqhk.co/zovaratigu/bt9ihgS/physics_class_9_icse_book.pdfIn PDF document text
    • http://good-amharic-books.comIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://buxebawimiro.epizy.com/human_wizard_5e_character_sheet.pdfIn PDF document text
    • http://wusanobe.rf.gd/51139969084.pdfIn PDF document text
    • http://wawaxujogoned.rf.gd/news_report_or_feature_article_about_ilocano.pdfIn PDF document text
    • http://tifilumiteva.epizy.com/tiretujo.pdfIn PDF document text
    • http://pofazutufugu.epizy.com/7754651200.pdfIn PDF document text
    • http://zawagebojirowe.rf.gd/ski_report_angel_fire_new_mexico.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000d0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F7 22516 bytes
SHA-256: 5eaa1a3e8594aaf8a04c93c50e53f15fee781934917ae7c31842e7f5bbd26e18
font_01_sfnt_off00010e21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E21 5504 bytes
SHA-256: 2efabbd9721c572fc90cdc6afd41c9ed23b7a13d36b877a2309c5471cf11cddc
font_02_sfnt_off000120c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C0 12340 bytes
SHA-256: 2c05539817b1ae58aa057b1a41fb38c3a629fb7c5b95c5ad40578f1ffb8ead80

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