Malicious PDF — malware analysis report

Static analysis result for SHA-256 719b00ff3270afb4…

MALICIOUS

PDF

42.8 KB Created: 2020-11-09 04:57:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 76fbb248a5a2477cd6a74dc315384a8d SHA-1: e0857334361f2a6793b8708b65e60faa83d56aab SHA-256: 719b00ff3270afb43fe9ffa8cd79aa14bceafba81b0f7b5118dc71f506d96e1a
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous external links, disguised as a repair manual, which is a common lure for SEO link farms and phishing. The ML classifier strongly indicates maliciousness, and the presence of embedded URIs suggests an attempt to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure itself facilitates the embedding of malicious links.

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://traffking.ru/aws?keyword=1999+infiniti+i30+repair+manual+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379601/normal_5f8f7fdd34bbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461201/normal_5fa304eba7606.pdfIn PDF document text
    • https://refanoripusegu.weebly.com/uploads/1/3/4/3/134306014/nuvibuzikomitef_damizamodulu_bidezovuviresu_podimusosufi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407983/normal_5fa33e1272266.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403557/normal_5f9432a6a392b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391907/normal_5fa152a9ecbe9.pdfIn PDF document text
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/ninafufi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426820/normal_5f9da0456f5dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370985/normal_5f92448123246.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://uploads.strikinglycdn.com/files/9c96fbad-4839-4bc9-bfc2-64912789d6ad/62375209558.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de1999b3-1e02-4344-bd73-3d798e960960/utorrent_free_download_hindi_movies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8e84cfa-f814-42c2-b970-11b3b848136a/centroide_de_un_rectangulo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe755414-92af-4610-ae80-eda85690f9e2/78996390523.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0a4943e-3603-4a60-98ed-d94a927b6c58/30286406556.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9548f135-1b71-44c2-b91c-bd118e593775/5608734285.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_off00005999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5999 5060 bytes
SHA-256: 70f557c447c44ff887c7dc4c031e00edfbc920cb8dc05914722cc560f63cf091
font_01_sfnt_off00006aa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AA6 10832 bytes
SHA-256: 4df5c98b5e5642c79faf4669211e457f9d4064eec6e63e7d3492fec3b2ee8919
font_02_sfnt_off00008e64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E64 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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