Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e00e98e9e38a79d…

MALICIOUS

PDF

76.7 KB Created: 2021-05-12 23:09:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d1178ef04a8129f7a34da607e3f58c74 SHA-1: 1008d722c4e1174ea406e93fb4de7a6d5a218db1 SHA-256: 4e00e98e9e38a79d3141112108a1953c6f37cb9d11ef35100bb783f412a33265
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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 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.
  • 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://dugedepap.ru/strik?utm_term=good+questions+to+ask+students+during+distance+learning PDF link annotation
    • https://cdn.sqhk.co/kewawukufiju/jcthcRD/tie_dye_shirts_for_sale_bulk.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxudofexal/GApT9gj/fonegizitopoziziropamujul.pdfIn PDF document text
    • https://cdn.sqhk.co/japuwejede/m5C3TRM/mailchimp_form_for_shopify.pdfIn PDF document text
    • https://cdn.sqhk.co/vopunokapire/iwghjb1/ocean_dream_marina_spa_villages_lanzarote.pdfIn PDF document text
    • http://soderenofironev.iblogger.org/how_to_write_your_college_essay.pdfIn PDF document text
    • https://cdn.sqhk.co/xufaribo/gfhf1gh/21637989947.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://roxutudutupit.epizy.com/velefulezigumorakotulopa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/556ccfc7-a9cf-482a-ad8e-d633073ef71a/does_the_samsung_s5_have_inductive_charging.pdfIn PDF document text
    • http://varewokumozikon.rf.gd/wonderful_christmas_time_piano.pdfIn PDF document text
    • http://xarajadumep.epizy.com/vodiladizu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfdd0df9-e84a-47a6-981a-d090f588dd9e/5079903925.pdfIn PDF document text
    • http://mutomipana.rf.gd/60696227727.pdfIn PDF document text
    • http://potubavaziripek.epizy.com/multiplying_fractions_worksheets_math_drills.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8679c6d3-5d0c-4a5f-bdb2-ddc35b68b0c6/61866741711.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ce14a5d-e378-4a32-b816-6c7084bd3351/75427479079.pdfIn PDF document text
    • https://eed7fa7e-4f31-4ba6-8269-e73f07ac74c5.filesusr.com/ugd/93374d_641f0c495c744549969d74ddc6053bca.pdf?index=trueIn PDF document text
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_674bd713139e420d876ec6d55c4fc3fb.pdf?index=trueIn PDF document text
    • http://nizovovik.rf.gd/48292517520.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_off0000eb58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB58 5328 bytes
SHA-256: ca2b9b476dd1c5725b3f5fa65a3a4a083bbef6b06196f8a9c74a6bf0d423b5c7
font_01_sfnt_off0000fd87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD87 11312 bytes
SHA-256: 85aa61888966562bb549630a00dc1a12afa6c6de2f57fbee47a476d3b8efae6b

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