Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdee24c5a297af02…

MALICIOUS

PDF

81.4 KB Created: 2021-03-19 08:40:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7c94624ec17286e542dbd03a034d51e8 SHA-1: 47d5573cfb95515f68d9db3156310e5005ca2c60 SHA-256: cdee24c5a297af027c65fb1a133b2e1e540f6be4b586bae788df769bec7f771d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many pointing to disposable domains and Weebly hosting, indicating a link farm for SEO manipulation or to distribute malicious content. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the sheer volume of suspicious external links suggests a high likelihood of malicious intent, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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://dafemum.ru/wix?keyword=saguaro+high+school+football+schedule PDF link annotation
    • https://xadidevoki.weebly.com/uploads/1/3/0/8/130873902/wikel.pdfIn PDF document text
    • http://mnogolidov.xyz/how_to_change_image_size_in_paintg9wj5.pdfIn PDF document text
    • https://wexasubofuxumeb.weebly.com/uploads/1/3/2/7/132740188/seweb-vomavafi-wuzuna-tezujoguwuw.pdfIn PDF document text
    • https://cdn.sqhk.co/tarekekog/6ifyZic/xiwugutenezol.pdfIn PDF document text
    • https://cdn.sqhk.co/fekesolip/gfUJ9hd/sesiz.pdfIn PDF document text
    • https://cdn.sqhk.co/mapetidul/ggWFgb9/zulopaweramijanunoz.pdfIn PDF document text
    • https://cdn.sqhk.co/lajawawinu/Bwekjd6/verse_chorus_music_definition.pdfIn PDF document text
    • http://plafond.xyz/pe_design_10_digitizing4aohi.pdfIn PDF document text
    • https://cdn.sqhk.co/gabebutiz/hbOjg1H/81924996867.pdfIn PDF document text
    • http://usacreditcheck.info/sennheiser_xs_wireless_manuale_italianojnw7a.pdfIn PDF document text
    • https://cdn.sqhk.co/xubewarow/dVgdhdG/17647592686.pdfIn PDF document text
    • https://cdn.sqhk.co/rigizisojix/cibidid/83845527886.pdfIn PDF document text
    • http://afracheat9.xyz/xezudinejegipasateputaufcex.pdfIn PDF document text
    • https://cdn.sqhk.co/jitolado/aLGgjg2/58148142622.pdfIn PDF document text
    • https://razivizufizide.weebly.com/uploads/1/3/4/5/134525322/litux.pdfIn PDF document text
    • https://cdn.sqhk.co/pajubopolak/sji9Mlm/fitetetenolaxoruzuvuse.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://69868269-04aa-4a0d-8379-1371762fd556.filesusr.com/ugd/d8beff_03a22a91d14e4935857f1a2af6242d65.pdf?index=trueIn PDF document text
    • https://1de4b56a-3309-4767-83a2-f1bb1ea7c594.filesusr.com/ugd/a6e5e9_722710684cac4a9eb1133bbb4a1f9d00.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dobesogum/casual_employment_agreement_nz_template.pdfIn PDF document text
    • https://01477de9-116b-42a6-a62c-54244336611e.filesusr.com/ugd/dea9e9_aa11e707ff714a2d96a600f64c4b1941.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/vozuporifawu.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_off0000f2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EB 5304 bytes
SHA-256: 99f46900c27375ddb8772b4a9afd6b04358cc579f7013fc0c8c41b189f6f4815
font_01_sfnt_off00010500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10500 10880 bytes
SHA-256: 777cb0572ad53868a9b7a1470c175ea2bdf963661fc12d040b8374cf9617e9f5
font_02_sfnt_off00012a2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2D 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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