Malicious PDF — malware analysis report

Static analysis result for SHA-256 828d8c036526ff0b…

MALICIOUS

PDF

93.5 KB Created: 2021-03-20 04:11:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 7fdd0c5146427c060d3b00956c5ee849 SHA-1: ea3bb9bad09c2fab8f49fe5bca5080a89dcaa229 SHA-256: 828d8c036526ff0b047fe376a971abe4156119d84f92fa537c04c4b7a656bf30
66 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 an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://xezojetit.ru/wix?keyword=paladin+optimization+pathfinder PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408355/normal_60226d10cfd8d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462982/normal_5ff0af1597280.pdfIn PDF document text
    • http://fortuneo-enligne.com/99902512306bl3re.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486563/normal_5fe101400879b.pdfIn PDF document text
    • http://takipleskazan.org/famepuvivugipexasazipo3qzl.pdfIn PDF document text
    • http://fofoketezifofi.22web.org/ncert_english_grammar_book_class_8.pdfIn PDF document text
    • http://matimomewojime.mypressonline.com/linux_system_administration_commands.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409607/normal_60030f4da8492.pdfIn PDF document text
    • http://useporte.xyz/what_is_the_newest_call_of_duty_game_for_ps4xzler.pdfIn PDF document text
    • http://drive4mclaneeffingham.com/52454202324gefo.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/1fb18169-d631-42be-858f-0a709e00b22b/where_to_buy_rainbow_vacuum_cleaner_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6a70eeb-91f1-482b-812c-f1676da16492/wow_classic_system_requirements_laptop.pdfIn PDF document text
    • http://kasojazosejona.epizy.com/92799529076.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b273077-eabe-4aa2-a2eb-539f275ba37b/7200542229.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/faa4bff1-fbaf-4744-8156-ee86455698f0/67456512893.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15159db9-f9e8-4881-853f-e70401b423ca/35385847947.pdfIn PDF document text
    • http://xomutojekes.myartsonline.com/43610296101.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8bafd14-d2a4-4a40-9c30-fb33665da6f2/stc_1000_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38c324c5-f5d1-4af8-87af-b48a423c8c91/maus_book_2_chapter_1_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_off00012fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FEA 5152 bytes
SHA-256: 089e29556b6e494adb11e2382c255967691ce24aacc4d1db26d9b54114bd835d
font_01_sfnt_off00014150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14150 11028 bytes
SHA-256: cb0ccd1f393caa971dbe8ff012b9b7ba31a0a8963638db5c4c0f76f5d8611f5b

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