Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed20b2d13b9ca579…

MALICIOUS

PDF

79.3 KB Created: 2021-04-04 16:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 7822202140bb1098dd9bf25a1a2b1ebd SHA-1: 05c159fd4925a0593e1f13c2b4dbe32fd5ae76c3 SHA-256: ed20b2d13b9ca579604b5cd4906518d7a41364c0e64b2cf69041b15571d720e7
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF documents. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external PDF link farm, suggesting a non-standard use of PDF documents for SEO manipulation or content distribution. The presence of a malicious ML classification and ClamAV detection further supports its malicious nature. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malicious content delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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/strik?utm_term=pet+rocks+omori PDF link annotation
    • https://paladagaludoke.weebly.com/uploads/1/3/4/4/134460366/541868.pdfIn PDF document text
    • https://zopodiwozexuma.weebly.com/uploads/1/3/4/7/134737972/c0e938041d.pdfIn PDF document text
    • https://jutineriru.weebly.com/uploads/1/3/4/8/134866815/b4c8d315c.pdfIn PDF document text
    • https://cdn.sqhk.co/tejusukaxajo/fIggPKo/r_type_final_ps2_ebay.pdfIn PDF document text
    • https://gitosupogule.weebly.com/uploads/1/3/2/7/132741155/7558762.pdfIn PDF document text
    • https://cdn.sqhk.co/xubewarow/4idNeEr/latimab.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/5aa10548-5677-4701-8ae6-d2822df7862b/countries_in_the_north_atlantic_treaty_organization_agreed_to.pdfIn PDF document text
    • https://636e06b3-920c-4898-b827-ef778bbbc101.filesusr.com/ugd/40512e_ca76f99227d34aadb5ec5cf2891392e7.pdf?index=trueIn PDF document text
    • https://caa91486-5fcc-43b7-8b2b-5b817ae85bbe.filesusr.com/ugd/26bbcf_2a39cf65ba024561b410b72185ba1406.pdf?index=trueIn PDF document text
    • https://146c8b6c-0b46-450b-8ed0-b45f1e2a4974.filesusr.com/ugd/b58d21_8cce4c60239548b7bd9ad1a8bfc3913c.pdf?index=trueIn PDF document text
    • https://dd54f144-242a-4a88-9385-6c39f9996aab.filesusr.com/ugd/9f32c1_a02dc27df2914f15b4a97f4defa546c6.pdf?index=trueIn PDF document text
    • https://855e1e5b-0daf-4dce-aa73-dfad2bfec5df.filesusr.com/ugd/ced2dc_a081c3d59126481099cdbcec8164ec4b.pdf?index=trueIn PDF document text
    • https://4590046d-f0a9-4171-b8a0-56ff8c1fe63c.filesusr.com/ugd/0bfb20_4c8b05c12ab848ef863df907b1ceec9b.pdf?index=trueIn PDF document text
    • https://d190c387-1498-4382-a59e-98d1a0a9794c.filesusr.com/ugd/a91264_dcb8f1bea9114ddf84f9509779ccb9d1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ef4ac69-b99c-4f70-8d30-71dff0696e4f/30385648419.pdfIn PDF document text
    • https://8137cd1e-393d-4948-8193-eca935452849.filesusr.com/ugd/756799_3761f449250a4ed1ae1bd6ab6e832922.pdf?index=trueIn PDF document text
    • https://3e1af3dc-cf37-4f58-935d-0a6065bc5ce9.filesusr.com/ugd/3ca236_7825fb026333496a9265b26b9775f44e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4595e96f-331c-4800-97e3-97aea570871c/fallout_4_bobblehead_list_alphabetical.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/155c453d-ebe9-408f-9205-36abbd9b0cc6/2008_honda_accord_service_manual.pdfIn PDF document text
    • https://f3dbd103-cf2f-44fc-b0ad-c9004dc38af2.filesusr.com/ugd/1f2646_77549a54644344a3926d96b6c7ae6d4f.pdf?index=trueIn PDF document text
    • https://7f3356c1-ec1f-498a-9d41-5b36c14d87b7.filesusr.com/ugd/98d33d_c09ea15aa7f4432a8ff3622b8f37b023.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3D 4768 bytes
SHA-256: 9c4c6bf594138c11ce1a8acc56b3722416ae6a2ca0cc912fdc2ed6b8796ba044
font_01_sfnt_off0000fb5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5B 3640 bytes
SHA-256: 88ade6473a76d72260e3e287eee3b08a5490e19514d7c73ede39387fb5bdc093
font_02_sfnt_off00010973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10973 11084 bytes
SHA-256: 0765aceb7f880a1f3269de3e27e0ed12c97ae4c0d99bae090b5c68f6e37331d6

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