Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb40a4693db02f95…

MALICIOUS

PDF

72.8 KB Created: 2021-03-04 15:03:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 31830d55ebc7b6a8a1cd3088b7dd29ab SHA-1: c5104ebf239ae8c94d6e7b4682e0a7a826d1f1ae SHA-256: eb40a4693db02f95a5c26d4bcf87d94f1306173df7717c05ee49b8fbdc72a4da
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-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.
  • 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://dugedepap.ru/123?utm_term=propresenter+free+backgrounds PDF link annotation
    • http://titanovyi-filtr.ru/dakujuxujosulensojny.pdfIn PDF document text
    • https://xozisimoxu.weebly.com/uploads/1/3/1/1/131164350/jireledowixu-pujipusoxigirab-gipesifofed-dukifawoko.pdfIn PDF document text
    • http://thecet.xyz/australian_date_and_time_format5f5im.pdfIn PDF document text
    • http://remontvorot24.com/nusoledusuwepekerivubue6gkb.pdfIn PDF document text
    • https://lodirunesu.weebly.com/uploads/1/3/0/8/130874391/vilogewulanizadigo.pdfIn PDF document text
    • http://gifozuxozud.22web.org/cuales_son_los_tipos_de_investigacion_cualitativa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fec36ecc-85b7-40ac-a3dc-29066d941e24/dababisene.pdfIn PDF document text
    • https://16012499-1299-48b0-8cdd-5f23a7749958.filesusr.com/ugd/fafc38_747e70a8092f4bbda19c0b0c79de2001.pdf?index=trueIn PDF document text
    • https://551f0ad2-75d1-4009-b90b-2f3e3e20230b.filesusr.com/ugd/c2bf0a_fbe2812eb79344a6b265601dccf75cb9.pdf?index=trueIn PDF document text
    • https://5902ff30-e651-486c-ac37-3e8383bfa78f.filesusr.com/ugd/f35da0_b05da45f1af145bdb5fa5bbe127ac026.pdf?index=trueIn PDF document text
    • http://jimavuzeladones.epizy.com/lamogaregajoduwifujagidej.pdfIn PDF document text
    • http://suginuzebaluwom.rf.gd/seneca_woodworking_parallel_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cde176a7-7cf4-4fd0-8d3b-69b9dcc8f31a/dakom.pdfIn PDF document text
    • http://jemekeluvakowop.rf.gd/kukidopisizetod.pdfIn PDF document text
    • https://48e6b720-b653-4920-beb0-7ef171ab6ab9.filesusr.com/ugd/d9d1f5_6c38a23cdd534a4eab99c845058967c6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c685868f-ccab-4f60-bdb1-5c23518c025b/xajizazaboworatexa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1db4411-0f30-4e8c-93a3-f5ff00370aa5/how_to_put_the_bat_grip.pdfIn PDF document text
    • https://083189c9-8220-4687-a375-57be19a37228.filesusr.com/ugd/909b15_25c4acef23a94b59b21834e2375f63a0.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_off0000dec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC2 5496 bytes
SHA-256: 9747d06023a1b3bb3afe5b1fbe45bd1e708d235471d6743937b7b12ccaddf7c6
font_01_sfnt_off0000f17a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17A 10616 bytes
SHA-256: 00dffc9b2570492b0e353d10d5a3d2418297100b3ec6e416c21add62f2df9811

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