Malicious PDF — malware analysis report

Static analysis result for SHA-256 bff753a8ddf9a19c…

MALICIOUS

PDF

80.3 KB Created: 2021-05-25 04:37:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9f73d8e4be0794247dd6600d86a8b4e5 SHA-1: 22bb4a3518e73f42aed99fa06d6d0aaa021d7972 SHA-256: bff753a8ddf9a19ca76d3f20034bfea1621244ed3bffdb2052e25b86b6500ee6
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 0.9998

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 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://ponafet.ru/strik?utm_term=download+adobe+premiere+pro+for+free+windows+10 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4501998/normal_5ff958954c1dc.pdfIn PDF document text
    • https://wadapunefivuda.weebly.com/uploads/1/3/4/3/134307948/8bd6c54096.pdfIn PDF document text
    • https://bolefusugo.weebly.com/uploads/1/3/4/8/134868203/boselajita.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393631/normal_6001f033ab149.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408875/normal_603338f9a85f1.pdfIn PDF document text
    • https://kobirozo.weebly.com/uploads/1/3/4/8/134846370/pafisotejizinuni.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/44e4979d-ccbe-43bb-a736-0880c4a113c3/how_to_host_a_book_club_on_zoom.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/kenmore_elite_dryer_troubleshooting_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e70449ed-8a3d-4bea-963f-9522b1755264/20295394741.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/what_is_the_synopsis_of_les_miserables.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71b55b3e-6ea3-467e-a4d7-75519b734154/desarrollo_de_nuevos_productos_alejandro_lerma_kirchner_descargar.pdfIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/archibald_macleish_j._b.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60ffae4d-dcbb-46a4-bc81-19f63e86662c/23818188408.pdfIn PDF document text
    • https://s3.amazonaws.com/ladojenefe/bike_repair_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/regression_line_worksheet_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/062af1ab-fdd0-48a9-8c17-3a6ee05145eb/sotevutodebivurerapufi.pdfIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/52730521603.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/4489361174.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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5C 5612 bytes
SHA-256: 82685185a4a8cbd6d1a5e4e54ac8507211b61cbb427764eb4107240cd9b7e8f6
font_01_sfnt_off00010f72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F72 10672 bytes
SHA-256: bb59f4af6eda9ab4203a2e59ba2870553d3447a0ef8a1dc625b9735cf5b09380

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