Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed8d285e6b80891e…

MALICIOUS

PDF

75.5 KB Created: 2021-03-14 22:08:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10cee28e375972b4efa883da5bc735d0 SHA-1: ecae5fd718c6375efe03aab05b728eee97cf1573 SHA-256: ed8d285e6b80891e22dd5ca648d300f7d0c26c72234e5aa74b9852cd917c4c22
186 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous external links, with one prominent URL pointing to 'https://crophysi.ru/wix?keyword=brush+killer+walmart', suggesting a link farm or phishing attempt. The PDF structure and embedded content indicate it's designed to redirect users to potentially harmful websites, likely as part of a broader phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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 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://crophysi.ru/wix?keyword=brush+killer+walmart
    • https://cdn.sqhk.co/gulanuwe/gyjcjba/how_to_make_pumpkin_seeds_recipes.pdf
    • https://cdn-cms.f-static.net/uploads/4408184/normal_6016d8f85e4ae.pdf
    • https://cdn-cms.f-static.net/uploads/4470825/normal_600ceee1bfeab.pdf
    • https://static.s123-cdn-static.com/uploads/4388416/normal_5ff4d274c470e.pdf
    • http://fekosuse.getenjoyment.net/61701078469.pdf
    • https://pewarefat.weebly.com/uploads/1/3/4/3/134361746/dazavizelezir.pdf
    • https://bewepuxajijasi.weebly.com/uploads/1/3/4/3/134362307/fizat.pdf
    • http://sigisuzuk.getenjoyment.net/84767573288.pdf
    • http://betijeduw.getenjoyment.net/ray_ban_black_aviator_sunglasses_price_india.pdf
    • https://cdn.sqhk.co/duxisabaza/9CijpPT/kokevubop.pdf
    • http://fizebiredasibi.mypressonline.com/warhammer_fantasy_roleplay_2nd_edition_character_sheet_fillable.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://994180ce-385f-4272-9833-4a204a825e0f.filesusr.com/ugd/ec0c41_985e46a27d1248d8b4527e59eb987d17.pdf?index=true
    • https://4cf2acc4-d143-4013-a78d-f21de0873c4f.filesusr.com/ugd/e4636f_8298daf63d6b4b3d87992f7371dcd322.pdf?index=true
    • https://uploads.strikinglycdn.com/files/bbd670da-8fb0-4287-a50c-79b45f0efc78/linksys_dir-655_manual.pdf
    • https://1c54689f-8f60-44d8-8d81-b144d6ea8ada.filesusr.com/ugd/787b0a_63364c6e43a4419b9af0eb89429b9699.pdf?index=true
    • https://uploads.strikinglycdn.com/files/bf3e0427-8aba-4ad3-aacc-ae90794fc350/zexutukuzede.pdf
    • https://uploads.strikinglycdn.com/files/a6dde8dd-7131-4d0e-86bf-3d0dc39787c1/30538216212.pdf
    • https://uploads.strikinglycdn.com/files/6a4b143c-ce4d-4230-8d9a-30a074ba165b/what_does_a_large_sweet_potato_look_like.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eab0.bin
c8b97fec3f8697236167e64ec34d0b2d7f0fe8e8196cc8c6c64723544ff35402		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB0 5132 bytes
font_01_sfnt_off0000fc07.bin
12ba3605950720e7df79245d0cb15bfea8081a16f0c9123d462e8d890b8164ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC07 11004 bytes

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