Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c3a94a65e2e78f…

MALICIOUS

PDF

99.1 KB Created: 2021-03-24 00:26:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3e9815a46d016dee193ce8cdc7df656f SHA-1: 98549968baf36f72dccab15cde68bf0c296a31ce SHA-256: a4c3a94a65e2e78f6d3421e4f997253c5199215147642da316f434df753de7db
156 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 0.9995

Heuristics 5

  • 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.
  • 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://pelibifir.ru/strik?utm_term=which+is+the+best+app+for+english+speaking PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4454668/normal_5fc62b9e998f1.pdfIn PDF document text
    • http://markettop.pro/instagram_image_full_sizewwm12.pdfIn PDF document text
    • http://nekuwagibajese.getenjoyment.net/aesthetics_a_reader_in_philosophy_of_the_arts.pdfIn PDF document text
    • http://kesuvajeb.scienceontheweb.net/43869341059.pdfIn PDF document text
    • http://lobabinuladeri.medianewsonline.com/7154550961.pdfIn PDF document text
    • http://localdesign.me/74337574318w4c2r.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461497/normal_600848c67f044.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375344/normal_5fed614a1d3b8.pdfIn PDF document text
    • http://ubsvp.com/kindle_app_for_laptop1rmnm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469645/normal_5ff89a7e7a01a.pdfIn PDF document text
    • http://twenty-promo2020.ru/255544497895283u.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498842/normal_6000f6d4a72ac.pdfIn PDF document text
    • http://virivuluk.getenjoyment.net/83225756848.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484093/normal_6026277a8fc2d.pdfIn PDF document text
    • https://cdn.sqhk.co/tezasevimab/Mjhiaii/album_songs_free_isaimini.pdfIn PDF document text
    • http://rabota-plus.club/are_glock_conversion_kits_legal_in_californiakl9ni.pdfIn PDF document text
    • https://cdn.sqhk.co/wolanojijen/c9Mdmii/7647142068.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zowofiz.myartsonline.com/bruce_schneier_applied_cryptography_2nd_edition.pdfIn PDF document text
    • https://8717ace1-8174-44a1-9f98-e7cbf9e9ed94.filesusr.com/ugd/14e3be_67ab6cb55c634517bb264e512a12e886.pdf?index=trueIn PDF document text
    • https://1527c8d3-3321-4e9f-872f-e2bebb57bac2.filesusr.com/ugd/bf2d42_4e77427673b84b30893ab04796e23abb.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12459 3140 bytes
SHA-256: dc31f5c19ce33f40c8e88ecb15f9679fd5e95d64bfb682566bd96f876a9420a5
font_01_sfnt_off00012f59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F59 5492 bytes
SHA-256: a6206760dc52ed73b44c60fcef769475adfd1e77ffe32cb7230dab0d4189331a
font_02_sfnt_off0001421c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1421C 11544 bytes
SHA-256: ed75313e6274fb775cdd3464b759a60cc454792d2752c0ce0d657b53484ebe7a
font_03_sfnt_off00016919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16919 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd

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