Malicious PDF — malware analysis report

Static analysis result for SHA-256 42f53cff50995435…

MALICIOUS

PDF

79.1 KB Created: 2021-03-28 11:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 394b631706cbac96c9ca14d70cd8bb95 SHA-1: 48cbe76a632707f3d65850afdd545b084e923a98 SHA-256: 42f53cff509954352f1ac4fb7787a7a5bc178406da0d98f6d01fb30a380cbcff
134 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 and presents a deceptive download button. 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nipisod.ru/wix?keyword=positive+discipline+pdf+download PDF link annotation
    • http://tejowigasinafu.getenjoyment.net/woxovesexaradonegi.pdfIn PDF document text
    • http://sufawevugut.mywebcommunity.org/applications_of_partial_differential_equations_in_engineering.pdfIn PDF document text
    • http://shtangennstutkupitseychas.xyz/96305206093ceqoz.pdfIn PDF document text
    • http://raisinshq.club/naval_training_plane_crash3lz64.pdfIn PDF document text
    • http://vandify.com/22149793025qq1we.pdfIn PDF document text
    • http://hellochildren.online/30354429820go157.pdfIn PDF document text
    • http://cosmosqrab.online/dujugalomobiwugebunc0n5e.pdfIn PDF document text
    • http://shothard.site/4986592854s0ygx.pdfIn PDF document text
    • http://detonic-italy.website/xurudotafakesavagudoragh9pm6.pdfIn PDF document text
    • http://halfraire.xyz/bogadexutufal65ulm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://gagolabirej.atwebpages.com/26134835165.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e976391-f344-4f94-aa74-0e5fc58562f1/the_red_pyramid_chapter_12_summary.pdfIn PDF document text
    • http://xekabotiwuker.atwebpages.com/69977689385.pdfIn PDF document text
    • https://s3.amazonaws.com/roxawo/prevost_h3-45_passenger_coach_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a24e9beb-c0f7-450f-b11b-b80575c56e89/dejepi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a734728f-e9db-4cdf-8bff-c4b7de18c7d9/57639852224.pdfIn PDF document text
    • http://laxuzoto.onlinewebshop.net/chemistry_interview_questions_for_teachers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/101b7937-0473-43e0-8309-af2c68e8f242/mirror_of_common_error_english_book_download.pdfIn PDF document text
    • https://s3.amazonaws.com/xedewofuretujo/7276827349.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c825d460-8565-4be6-b8cd-c2e3c75f1f55/wotivuvofivozuw.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA72 4992 bytes
SHA-256: c8dd8b12a15ce2bccadbd30989b24d4627fad91beb4a7c4cc4d287dad3c0cf56
font_01_sfnt_off0000fb95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB95 11232 bytes
SHA-256: d410722db7b7257b609866cfc777882a39235ed3dc3ecb5d481780b298a259f1
font_02_sfnt_off00012122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12122 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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