Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aa898b6b78f1b43…

MALICIOUS

PDF

84.3 KB Created: 2021-03-16 18:42:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 70df592f7644857186b483ffd0e002ae SHA-1: 513e5faf2339bd9c3e13221da0820452f18f195e SHA-256: 8aa898b6b78f1b43a12645ac8024b11b86332176e676beb2fe7d4be18c66c49a
156 Risk Score

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 0.9997

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
  • 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.
  • 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/wix?keyword=star+wars+saga+edition+best+race+for+jedi PDF link annotation
    • http://telgrm.site/zepiv2otjb.pdfIn PDF document text
    • https://zuvagojajom.weebly.com/uploads/1/3/5/3/135398962/d257e0.pdfIn PDF document text
    • http://investorlands.ru/tumuzrxnq9.pdfIn PDF document text
    • http://trylait.club/is_coursera_data_science_specialization_worth_it2wgll.pdfIn PDF document text
    • http://cetapp.xyz/venta_lw45_airwasher_2-in-1_humidifier_and_air_purifier_reviewb33qq.pdfIn PDF document text
    • http://discovljzg.fun/museum_registration_methods_5th_edition7dqr3.pdfIn PDF document text
    • https://dugepawegozil.weebly.com/uploads/1/3/1/6/131606694/2708221.pdfIn PDF document text
    • http://legiontry.online/roxupekinawowevitofipbwj6j.pdfIn PDF document text
    • http://wisitens.online/can_scoliosis_be_cured_with_exerciseo5srn.pdfIn PDF document text
    • https://fanonobumoxevo.weebly.com/uploads/1/3/1/3/131384335/nezojizolegisaxaxon.pdfIn PDF document text
    • https://cdn.sqhk.co/toxinize/ijcf04L/larewux.pdfIn PDF document text
    • https://cdn.sqhk.co/balaragu/UChhhUd/easy_cake_recipes_for_beginners_without_vanilla_extract.pdfIn PDF document text
    • https://kelogukagikuval.weebly.com/uploads/1/3/0/7/130739039/doxokenanuxawopapux.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/fojaxexino/dapataropazorer.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/kitubabafedamazuga.pdfIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/non_disclosure_agreement_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/fipufa.pdfIn PDF document text
    • https://s3.amazonaws.com/geraromu/boduvufenesofipadufekomo.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/pujurem.pdfIn PDF document text
    • https://s3.amazonaws.com/pokixovuxik/american_revolutionary_war_uniforms_for_sale.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_off00010a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A74 5568 bytes
SHA-256: 3a0f8f4ff4d26b5752398544b59e74db599326d6bdf96f820f871c8e01527032
font_01_sfnt_off00011d91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D91 11076 bytes
SHA-256: 1b6543df0a625b621cbf71cdefd3ac090de02c99c30c1787ff3ecf9636c8d9c7

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