Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bc59619aca8af9d…

MALICIOUS

PDF

76.7 KB Created: 2021-04-05 20:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 071380e80e259fbfa29fc07fbae2ad32 SHA-1: 17b7fe686bd8cacaa1711ed52bfc5489ac8880db SHA-256: 2bc59619aca8af9d6446d21e8e74bd5072c17ac6ab0fe2ffa87187e6130ee5b4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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 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://botokaw.ru/strik?utm_term=define+the+term+software+development+life+cycle PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459165/normal_5fda56673f143.pdfIn PDF document text
    • https://tofariviviri.weebly.com/uploads/1/3/4/1/134109347/tejuwo.pdfIn PDF document text
    • http://sweetygirl.club/fatca_reporting_model_16qia5.pdfIn PDF document text
    • https://kasuvimifimo.weebly.com/uploads/1/3/1/6/131637099/1396411.pdfIn PDF document text
    • http://meetsucre.pro/ralekesalunadoguj1efuo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487935/normal_6001e88ec7482.pdfIn PDF document text
    • http://kavuxolabazili.iblogger.org/rusefezuwuf.pdfIn PDF document text
    • http://astrology-personal.online/how_to_replace_ear_pads_on_jbl_headphones39o62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426556/normal_603908eca1787.pdfIn PDF document text
    • http://sun-italy.space/38392657740ei0kd.pdfIn PDF document text
    • https://xikematevi.weebly.com/uploads/1/3/4/3/134392378/4531410.pdfIn PDF document text
    • http://vkysnaya-eda.site/85240111470gsgnn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://supajiwa.myartsonline.com/97948214683.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a716888-5587-409b-8e8a-b9ee8f71e80f/tevuwipediduki.pdfIn PDF document text
    • http://zajupulavofawi.myartsonline.com/aaos_critical_care_transport_2nd_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11ff0ee8-d41e-4c9d-ba57-01682cea127c/kerosene_heater_directions.pdfIn PDF document text
    • http://wudunerizipite.epizy.com/mastoiditis_adalah.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6a09c90-11d6-4087-b289-02ea49773f1b/39001329197.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_off0000ec7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7E 5648 bytes
SHA-256: 63a834c1628ca8d6a00ed00f1362c8dad0dd233b6aee40e5d8aed9629cc5b5a3
font_01_sfnt_off0000ffaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAF 11148 bytes
SHA-256: fa4e096a2786fbb42c0b8a5cd839bb30ff89ff1d8c2fed9835e40e6edd5dc662

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