Malicious PDF — malware analysis report

Static analysis result for SHA-256 8143aa152231f1ec…

MALICIOUS

PDF

81.8 KB Created: 2021-03-11 16:00:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: eaec40055ff3b49056e3605263e54e71 SHA-1: 9e45f4caae6549538d8e50c944477fd815d1dcd0 SHA-256: 8143aa152231f1ec77abbc37101a9f07addbc9b27da5b5f18fb1fa49eafa43f4
166 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. It uses a password-protected-archive lure. 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 0.9967

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://jumiwimov.ru/wix?keyword=one+click+root+apk+email+and+password+crack PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4468274/normal_5feefd5865d97.pdfIn PDF document text
    • http://vevufilusik.scienceontheweb.net/41772174885.pdfIn PDF document text
    • http://gamukanemafutu.mywebcommunity.org/2010_camaro_zl1_convertible_for_sale.pdfIn PDF document text
    • http://peskomment.ru/64001926204wh2aq.pdfIn PDF document text
    • http://gizovivomiz.getenjoyment.net/60736912771.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423427/normal_6034e0a5d4172.pdfIn PDF document text
    • http://subejewumo.scienceontheweb.net/ryobi_leaf_blower_40v_home_depot.pdfIn PDF document text
    • http://creditpm.com/jepomesozovavahqt0.pdfIn PDF document text
    • http://netewe9.xyz/mic_kbpc3510_datasheetj3j2m.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451206/normal_5ff7588e1c57d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388271/normal_601b2478052e9.pdfIn PDF document text
    • http://rosutob.getenjoyment.net/basic_english_worksheets_ks3_free_printable.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/jasadavebaga/bawexa.pdfIn PDF document text
    • http://bolirazebaf.myartsonline.com/cisco_linksys_e4200_router.pdfIn PDF document text
    • https://s3.amazonaws.com/sutawowirosuvuv/79382855265.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34f89edf-3cae-445f-bd02-bae82aac3e62/29217725437.pdfIn PDF document text
    • http://gomugugagaf.onlinewebshop.net/fender_mustang_20w.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9401f258-0d1a-418f-98f0-4082bdec2b02/le_petit_nicolas_louisette_translation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f240604-1233-434e-a147-467f36809748/hp_laptop_6470b_specs.pdfIn PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/91399714209.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/abyss_rc_guide_osrs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c7442ef-6d30-440d-87a9-9d72c4d90d4a/83105871401.pdfIn PDF document text
    • http://doriponesarom.myartsonline.com/what_is_the_importance_of_potential_and_kinetic_energy_in_our_daily_life.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/29748530481.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dbc52e7-df43-492e-adf8-c652ec232118/lufadazizal.pdfIn PDF document text
    • http://lapetagalelan.myartsonline.com/what_is_brainstorming_in_reading_and_writing.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_off00010339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10339 5404 bytes
SHA-256: 5c0964a7c02e4855f514d0734d582595e00a387fd719904e3d2cb55f7a17c736
font_01_sfnt_off00011593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11593 10316 bytes
SHA-256: a94942584156e01034b9fe37e3382c08f4fb94f07e76c838a27d8b03c16d8c4d

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