Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6f5426e066f60fe…

MALICIOUS

PDF

75.7 KB Created: 2021-05-29 08:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 033d9c5000548ea7a58d31105886ce81 SHA-1: 2c1622bda1a516b83800adebd0764fa63c9d23d9 SHA-256: b6f5426e066f60fee95d7ce0aef65f8a9db6682831795327054119f5806a2ce3
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 0.9996

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://lozipotod.ru/123?utm_term=apparatus+used+in+laboratory+pdf PDF link annotation
    • https://kawuloxegulul.weebly.com/uploads/1/3/4/3/134389306/2556100.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479439/normal_605285d03b6b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382189/normal_60270f2b34240.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451927/normal_606ade732ac2e.pdfIn PDF document text
    • https://jedifubebevaze.weebly.com/uploads/1/3/4/8/134873515/1394364.pdfIn PDF document text
    • https://zudezujom.weebly.com/uploads/1/3/1/3/131384555/bikuri-poxezozezafaku.pdfIn PDF document text
    • https://wevetajapejo.weebly.com/uploads/1/3/4/6/134636724/2098664.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/21be6bb6-e923-498e-a571-e490950a1e50/que_tipos_de_organizadores_graficos_hay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8eb22e39-adcd-46a6-af06-0a0264d8842e/ferotutulusifoburilakur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8d569fc-4384-44af-b563-023f9259af31/zulenum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7753458-4a53-4331-8a58-6e5ded8ca2fc/sold_patricia_mccormick_ebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed8a59bc-88df-49bd-92d5-7da0400cd919/takideba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4408016-8c02-43da-be3a-29b29241945d/zusaligumanebawezisi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a5cf84a-f460-4c4d-bd09-7dd648adc985/63511480565.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5eef1afe-f815-4721-95dd-ed81efb287de/fusenitil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbb58895-ee1b-4524-97cd-9939a9bb18e2/79816913652.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93ad66ce-1489-4237-a604-644596774c09/jimogazizigelopezejeluba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aadf581a-47e3-418e-b650-41d723f39726/create_your_own_paint_by_numbers_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e67dfa8f-8fad-4703-a6fb-a1f199a475b1/how_much_does_a_walk_in_humidor_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0cc43ce-ac89-462c-ab09-e24c7f465a2f/what_is_negative_deviance_in_sociology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c18d8ff-ae85-49a2-834f-969740c7a7db/voxudoku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bb04609-04de-4a42-b915-294cf0364a93/intro_to_brain_and_behavior_6th_edition_kolb.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_off0000e988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE988 5264 bytes
SHA-256: 6414cbae9a0e9d91acb81158a3639f3b653ac9e0b5cbea2d542fb69de96efdee
font_01_sfnt_off0000fb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7E 11268 bytes
SHA-256: df5a021b7cd452d981b20c0f5e54395bee536ec9077529ce345f7475cdb9e6f3

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