Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6995643accd98ae…

MALICIOUS

PDF

86.2 KB Created: 2021-03-31 22:05:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 8c94f57d0b3d8a018c9a3991e6ea052e SHA-1: 568a05205a9bc27b81abf384b96a1914dcdd60fd SHA-256: c6995643accd98aecd71b8d19fb41cdb494c6bbde802661222bf595fe3f6efbe
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 0.9994

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://jacksth.ru/award?keyword=princeton+review+gmat+book+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450635/normal_6044fb7573319.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383704/normal_600ebd4919f4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402717/normal_6041ea2b049f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497369/normal_601b34b271fe8.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/a3058708-c526-469e-9930-606741e61dea/7008597005.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99584393-c039-4c6c-8b25-349f9bb8dd9e/71729663508.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b25377f-8897-4d1c-a986-21f7d00a6a0b/77074999552.pdfIn PDF document text
    • https://s3.amazonaws.com/fipijife/baa_baa_black_sheep_rhymes_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/59786714569.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea65283b-ba9c-40c0-8b38-fb2bb3fec43d/dazunitoluzamafovazowa.pdfIn PDF document text
    • https://b01ec662-dec5-4f54-b977-8708717d6054.filesusr.com/ugd/07e02c_72f27fc68ea3432a9593bf63f32da99c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b3d0c22-edee-4171-8b4d-e45f80b83b45/bokutuduzefobivowofisakaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7f80c0f-e77e-4606-8849-f54764202c70/software_development_life_cycle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eccfd0b1-d031-4399-8417-6a82d026256e/5317127884.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09d055ef-bebd-476b-8514-79a12cb4a47d/56295305542.pdfIn PDF document text
    • https://fab88ded-2f12-46c9-b6ec-f290036286cc.filesusr.com/ugd/cce69c_71a84600a5094644802c037825091c64.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/58571568807.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70b19d91-7c1c-4d8f-98d7-3ae122402da8/how_to_write_a_movie_script_in_telugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bf80a0c-173e-4eb9-b68d-da47e3cd8f18/lazotizarawemoxoje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c83fc16a-9578-4e92-ab86-c55b1b6a6c9e/instalacion_de_gas_domiciliario_bolivia.pdfIn PDF document text
    • https://s3.amazonaws.com/batiku/2419938883.pdfIn PDF document text
    • https://f55c6975-0091-4942-a106-dc80285e5f9d.filesusr.com/ugd/8a4248_86fd4dfe54644f379d733b50db665826.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a39aaa15-5884-4d6d-9f57-34cd4212a79c/14322611447.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_off00011050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11050 5624 bytes
SHA-256: 96f7620ff5fd62b4628816b24817b68aa27ea17f97da23d010f3b7b37bf21005
font_01_sfnt_off0001236c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1236C 11884 bytes
SHA-256: 9e65445ec6f6be9f81cd9583ebd58394cd138e10edcf4729124d7ef2f6fe47e3

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