Malicious PDF — malware analysis report

Static analysis result for SHA-256 91c7623e012de8ac…

MALICIOUS

PDF

37.0 KB Created: 2020-11-05 23:04:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 541d63cc8a95582423e4be49afdbf4fa SHA-1: e78bfe7858f16354204f09cae2c96567a81ce5c5 SHA-256: 91c7623e012de8ac4e51c7fe6d58ffc32de02833370a0ae998cb3022d7267dba
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded external links, as indicated by the PDF_SEO_LINK_FARM heuristic. One prominent URL, https://trafficel.ru/aws?keyword=village+school+marblehead+ma, is directly referenced. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous links suggests an attempt to manipulate search engine results or redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://trafficel.ru/aws?keyword=village+school+marblehead+ma PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378621/normal_5f9c041f70940.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369777/normal_5f9a10cadd015.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390057/normal_5f938a555ab50.pdfIn PDF document text
    • https://jufaxexave.weebly.com/uploads/1/3/0/7/130775513/jovegoxo.pdfIn PDF document text
    • https://nukevokisoget.weebly.com/uploads/1/3/2/7/132711970/6204283.pdfIn PDF document text
    • https://lodirunesu.weebly.com/uploads/1/3/0/8/130874391/bavaso.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/6270e425-56f0-485f-b0cb-0e8eb8ec248e/88791386367.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1832ad69-de0b-49db-883c-fedc66ac6701/70163636272.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c16a459-5ab5-462f-ba92-c79160af77e8/zeriwined.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79e77a90-85ac-49b8-ae41-d1329984ddc2/jewovavujadofivug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0ff268f-5be6-4a91-98eb-be9c33fa04a9/elementalist_lux_forms_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92cb5f80-1efe-4063-85f1-fe22beac196b/rewevanamokifirorijedar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d8256ef-d13e-4f91-bf10-0b3f55e014d0/73612880096.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4648a56-d7ba-4ba7-b826-90d6788217fc/zoxizewodi.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E79 5460 bytes
SHA-256: d02f3e1f2ffceaaeaefa00377d694f8cb4f5243bec021569604c09ffbedc9170
font_01_sfnt_off000060dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60DC 12012 bytes
SHA-256: 81d8d44ee01013b01017bd61c1960187d4cd13b7292442e15a982769384accb4

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