Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5dc7639120d1253…

MALICIOUS

PDF

79.4 KB Created: 2021-03-15 18:04:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9e9cb17d9b7f8f74cedc6223119a2ae1 SHA-1: 570bc275895971716f2c98ced79c9e1c13b59deb SHA-256: c5dc7639120d125341617bed38e85dbcecd6dc847bf83fd27cb88e240a141541
186 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, a common tactic for creating link farms or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of external URIs and a link farm heuristic suggests the document's primary purpose is to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/wix?keyword=integers+worksheets+pdf PDF link annotation
    • http://doucheapp.xyz/femamufunugoeubtg.pdfIn PDF document text
    • http://pokypka.xyz/how_to_put_scope_on_daisy_powerline_880hteei.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://37e0f79d-b0c1-4727-b76d-5b759c81288f.filesusr.com/ugd/9c66ff_a9037fe783344e74989e0ebf63e4ac32.pdf?index=trueIn PDF document text
    • https://170d08c7-2527-4f8e-8bc4-cf7f6ffab704.filesusr.com/ugd/afe24e_9e5839edc4a44633b1b36aa6831b4395.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/69ed3ac7-65ff-4de5-bec4-afea627be5c3/ruwov.pdfIn PDF document text
    • https://51956041-da35-40aa-96c1-085c1f47c80d.filesusr.com/ugd/e6e573_aa14952764bb4634870ffcd3ae1eb84f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/690a3d7f-cdd1-4155-a9ab-87a285269548/63039608174.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/326e994b-17a3-4f91-a826-a99dc9be70a5/rinaji.pdfIn PDF document text
    • https://39c10a3a-92c6-412a-a1bb-b8a1fc48fbc4.filesusr.com/ugd/259099_655ffcda3e554bfcb46d952d2dd00e45.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/de3cef32-9324-474c-a17d-ece524be647d/guvosilafakobukupat.pdfIn PDF document text
    • https://82cb18f6-4a40-4824-ac11-10070f72ce02.filesusr.com/ugd/5aec95_aed4a603a25d48e798f2fb5a2cdf5616.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6d5e958-1825-432a-b6c9-e8b31db5199e/how_to_read_resistor_color_code_chart.pdfIn PDF document text
    • https://d7179dab-c972-4501-9f4a-16044ca71e84.filesusr.com/ugd/434f74_b62bb093da4440579441be13f6d0fc95.pdf?index=trueIn PDF document text
    • https://83f018a0-8e49-44f0-b57e-805e464a5f06.filesusr.com/ugd/10a4aa_238ebff8e78f491f94e5ece2dc09e95c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/39e59975-41ae-4d1d-a86e-287e0cef6772/deziji.pdfIn PDF document text
    • https://203e7bc3-08d7-4ecc-a8df-f797e0d4a079.filesusr.com/ugd/d4579c_eec96c2605d548e482fc05aebb204021.pdf?index=trueIn PDF document text
    • https://679cd94f-bb1f-411a-9684-d99498fe93d6.filesusr.com/ugd/ce16d4_33574cf98ece4ddc8e84eff275f5fb3d.pdf?index=trueIn PDF document text
    • https://8ab1a2d5-e5b1-44c5-a28c-e09959565f0d.filesusr.com/ugd/eb712c_dc119a82e3484a0b978d82f3bc197ec0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa8e776b-6e52-400d-8664-5342b78dc239/toyota_camry_se_vs_le_2017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31ab44e1-30b9-4a16-90cb-909f880d3190/95052353162.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3C 4896 bytes
SHA-256: 5b6db660dbd0b77fe3ffbe60c655f1537694916be8ce40e2916da1662f6aa8bf
font_01_sfnt_off0000fef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF0 10392 bytes
SHA-256: cf0432211659f887058b3933377a1d71da3bcdb45f2f485103a6f2db75605fd8
font_02_sfnt_off0001227b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227B 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

Open this report in the interactive analyzer, or submit your own file for analysis.