Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1d500d1797ab5ea…

MALICIOUS

PDF

82.0 KB Created: 2021-03-10 14:17:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: cf04dc6da73b035365aa571bcd1074d6 SHA-1: b0156e3367017a25e5b54d607d35911cc3dda605 SHA-256: a1d500d1797ab5ea1e37a344c4869c67eae1e2e6fc2a5c507fc85f9aaf789b0c
226 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of a 'Password-protected archive handoff' heuristic suggests the document's purpose is to trick the user into decrypting a payload. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://kuzutuzo.ru/award?keyword=couper+un+pdf+en+deux+mac PDF link annotation
    • http://xagakojitogiva.getenjoyment.net/gre_quantitative_questions.pdfIn PDF document text
    • http://tumuduwaju.mypressonline.com/multiplication_times_table_chart_1-12.pdfIn PDF document text
    • http://www.typoland.com/http://www.typoland.com/designers/Lukasz_Dziedzic/CopyrightIn PDF document text
    • http://www.typoland.com/In 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
    • https://uploads.strikinglycdn.com/files/1697eab5-5b59-4eae-853a-5466b9fa72e4/harry_potter_19_years_later_chapter.pdfIn PDF document text
    • https://s3.amazonaws.com/midizaxopazeji/18384293027.pdfIn PDF document text
    • https://a2c67b61-a01d-4053-b7ad-f1487bca8054.filesusr.com/ugd/24853a_a9efefba75104ccda4b1c3b253e17daf.pdf?index=trueIn PDF document text
    • https://a39ac558-8fe8-437d-9e10-dc9402d6cb9c.filesusr.com/ugd/1ebe14_bc870ff705c24462b069c260cb0e2a4d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/xazijuv.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/97759075943.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cd1adaa-8648-4396-912a-c50fec76ab97/nixon_the_unit_ss_change_time.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/753aa45f-7a22-455a-9858-52e34e8a641a/vocabulary_builder_activity_networks_answer_key_ancient_egypt_and_kush.pdfIn PDF document text
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_193dee8d86954ba6b6a7dfabb4585548.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9891178b-ee9c-4dbe-86ca-5a4c9150d619/sojarojafoto.pdfIn PDF document text
    • https://7afd96e6-4611-46d4-9b98-d111b897c281.filesusr.com/ugd/154221_b1a9a29f80f14fec8b68b6f2f4c8a49b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1824b0f7-f816-4df5-abe8-441eb58dffc8/what_is_the_unconditional_positive_regard.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6f607f3-63e4-4586-b76b-175274246188/la_mscara_de_la_muerte_roja_pelicula_descargar.pdfIn PDF document text
    • http://luxupuxud.myartsonline.com/nietzsche_gay_science_summary.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57D 6168 bytes
SHA-256: 9f07a400e75c177e496f395344003d4a7545e118b36bf59d530d47f9bb3550f8
font_01_sfnt_off0000f51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51C 4936 bytes
SHA-256: 39f1c13469b259a4e1cb9c284a51be4f6dff46b1b76aff9b2979095e80334c11
font_02_sfnt_off000105cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CD 11872 bytes
SHA-256: f8463122fda92732d88d884299f87b90c0c5ddd0f5c2fdbbbdff0783c918551e
font_03_sfnt_off00012b1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B1E 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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