Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ce1434a73e31225…

MALICIOUS

PDF

140.5 KB Created: 2020-11-08 23:58:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 376f468635c8d81969c7590f4d655d70 SHA-1: d6cea9f584b92ad2aa310e81f7b0d6983e36d451 SHA-256: 0ce1434a73e31225cfdf53d91f2c07ffd894914e208c80ca19d58db44fdbb0b1
96 Risk Score

Malware Insights

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

This PDF document is identified as malicious due to its structure, which includes a mass external PDF link farm. The document masquerades as a school homepage, but its primary function appears to be directing users to a large number of external PDF files, likely for SEO manipulation or to distribute further malicious content. No scripts were extracted, but the presence of embedded URLs and the link farm heuristic strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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://traffine.ru/123?keyword=conestoga+elementary+school+home+page
    • https://bugekawimilu.weebly.com/uploads/1/3/4/5/134589579/8765167.pdf
    • https://cdn-cms.f-static.net/uploads/4374364/normal_5f92b5c73e778.pdf
    • https://rulomegujenuguv.weebly.com/uploads/1/3/4/3/134329868/zewurefidopovud.pdf
    • https://veraweno.weebly.com/uploads/1/3/0/7/130739577/dudurojasav.pdf
    • https://cdn-cms.f-static.net/uploads/4382194/normal_5f8fadb313492.pdf
    • https://nidobafimenute.weebly.com/uploads/1/3/4/5/134526671/sitatedona-giriseboli-rogero.pdf
    • https://pitimonajavigo.weebly.com/uploads/1/3/1/3/131383860/dedf5a8a2.pdf
    • https://kenilajapa.weebly.com/uploads/1/3/1/0/131069910/403847.pdf
    • https://cdn-cms.f-static.net/uploads/4366047/normal_5f8c5a86bbb18.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zamuriza/rigid_conduit_bending_chart.pdf
    • https://uploads.strikinglycdn.com/files/3c33d477-55a0-4149-9bb7-8c4b6f6ed510/ultimate_alphabet_answers.pdf
    • https://s3.amazonaws.com/pazifetanegapu/how_to_install_oblivion_mod_manager.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_off0001edad.bin
393a2cb4ceef80ab79e08e77c1427232f266bfaf05514838c8cfd19bc28b1d44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1EDAD 5352 bytes
font_01_sfnt_off0001ffc3.bin
444051e2bcdb595dfb07d197bafb295ab0177eae149eceaef35a501af97589a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1FFC3 10936 bytes

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