Malicious PDF — malware analysis report

Static analysis result for SHA-256 84a349a075901cf3…

MALICIOUS

PDF

78.7 KB Created: 2021-03-23 21:40:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 901031c777b304416594782998865eb3 SHA-1: ef81ff9ce6b343b044e5fb8caaac0cb00adb4fe8 SHA-256: 84a349a075901cf3c37043cc453844231caa99d295fb4c2c41d4e525b635050b
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 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/strik?utm_term=can+you+leave+a+ceramic+heater+on+overnight PDF link annotation
    • http://getcabinets.xyz/warlock_wowhead_classic_guidecpkss.pdfIn PDF document text
    • https://cdn.sqhk.co/nopusixinid/hgek8zY/intercompany_reconciliation_report_sap.pdfIn PDF document text
    • https://cdn.sqhk.co/pojuzijix/hljd2gj/47927000916.pdfIn PDF document text
    • http://stingeksoj.online/46033623024sqr34.pdfIn PDF document text
    • http://judizoduti.iblogger.org/what_is_the_rules_of_magic_about.pdfIn PDF document text
    • http://wisitens.online/34295841450utca7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368768/normal_602735c32dc76.pdfIn PDF document text
    • http://qlemelest.online/is_blackweb_a_good_brand_for_chargersoo6u3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479470/normal_5fec94daf2b3a.pdfIn PDF document text
    • https://cdn.sqhk.co/kososojog/OjbicHK/tumble_ghost_hunter_popping_rod.pdfIn PDF document text
    • http://xupoluwifokolo.22web.org/30405141020.pdfIn PDF document text
    • http://reduslimitaly-ufficiale.website/jimexa2z7uj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5e20aa6b-77ef-4f11-9344-5454fb7c649c.filesusr.com/ugd/fb3aa9_f22ec461476a433aaeebe9aff15bb928.pdf?index=trueIn PDF document text
    • https://42172c5f-463d-425f-bc49-3536d5e9b788.filesusr.com/ugd/3e9aab_112eca310c904b01ae2ae0a29e891dea.pdf?index=trueIn PDF document text
    • http://tikokowekujuw.epizy.com/kozefakomesi.pdfIn PDF document text
    • https://6d4a8fb0-9a8a-4850-8aa1-2b5706121c9a.filesusr.com/ugd/ff2e72_6dd4e1802c1c4257b04fcd0f1e97d5c7.pdf?index=trueIn PDF document text
    • https://8c17aa34-c454-4d6c-a218-8929c845e329.filesusr.com/ugd/808cd0_6f0bfc1a62aa498cadafbb914c5668e5.pdf?index=trueIn PDF document text
    • https://997b2cc2-d96d-4654-b184-8a5d7ad473c0.filesusr.com/ugd/b8d08c_454155a87cde46f4ad2010099be2e0a3.pdf?index=trueIn PDF document text
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_f259f18ad53e46f9acca4b5eb4ddeec0.pdf?index=trueIn PDF document text
    • https://be08d7d4-326a-4801-be9d-4496af17a43b.filesusr.com/ugd/d31907_80a3de01c366411d9f9930a80e914869.pdf?index=trueIn 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_off0000f847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF847 5104 bytes
SHA-256: 56aef5ec563746aa7b1cc64754f5dbd8dd22eb49527d946c0bc4c9a4137d2aa2
font_01_sfnt_off00010984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10984 10476 bytes
SHA-256: 711d62ebc9e8bc43b0dab7e100930554680dc51628377b9acda2ddb42962a294

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