Malicious PDF — malware analysis report

Static analysis result for SHA-256 af3e3fda477fd4d6…

MALICIOUS

PDF

80.1 KB Created: 2021-05-28 13:42:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9fb9e45c0e95570a4248126487f38a5c SHA-1: ae3c116495544a4650efbc99fa6ae9d4f32c5410 SHA-256: af3e3fda477fd4d6138e7b80cd3512ee9ab65ffd0e1f637fc218742d088ac245
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/strik?utm_term=nexus+3+fl+studio+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464068/normal_600e9b861004e.pdfIn PDF document text
    • https://tuvuneboginat.weebly.com/uploads/1/3/1/6/131606819/7206825.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487625/normal_604748ef98d77.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4495039/normal_60b05a8774ccc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377100/normal_60172018b4dc5.pdfIn PDF document text
    • https://getukesi.weebly.com/uploads/1/3/4/7/134735407/ferozubuvafokubobo.pdfIn PDF document text
    • https://kolekidir.weebly.com/uploads/1/3/4/4/134441437/nelazanupapeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403428/normal_600bd38e2c828.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470841/normal_606ac012c97ee.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/fb0ba048-bbae-49a8-b523-7cbc4ae516ca/10115949460.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7abe7fb-fc13-496e-962c-6796f56077d2/existence_2_abbi_glines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cd99db2-5c8a-4bbe-968a-b04282f35481/95835400755.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65c6ae6f-6cac-401c-a7f6-f8d5cb8523fe/how_much_does_chuck_tingle_make.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5665aaf6-6ca6-42ba-ad82-7b3d21da38c2/wezizefi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdb6f6a7-f779-46d2-8ab4-9f3157d72bff/divergent_download_full_movie_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a25e2354-2e25-47c6-bd2f-2e11763f7dec/difference_between_2019_and_2020_camry_hybrid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b340a5f6-58bb-4fee-8607-158ea4fa80a5/bissell_powerforce_helix_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7960f87-f306-4ad8-8fb5-629de5e78d1e/94905408007.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1b2e3bc-e752-4ad2-831d-14354f2f9a29/siridawotimegamowig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa5bb195-8707-4b89-8f0b-7ce3e77e1996/shiloh_text.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_off0000fadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADF 5192 bytes
SHA-256: 0a4b0c7c6bde36a05fe0b4b63fd7f75f8f4e5bd88d8fbd46e80b3226f5ea1fce
font_01_sfnt_off00010cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB2 11256 bytes
SHA-256: fb2b0a021251de1ffc9403da784a2ec4b89141f41f62764d0c4947b7f0de0dad

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