Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7a4a7769e913ccf…

MALICIOUS

PDF

72.5 KB Created: 2020-11-05 20:47:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 8b9474f1c35dc73cc600841cd0c9d4c6 SHA-1: db8809988b18a50ac2ea44e92fe5e3117dd94f70 SHA-256: c7a4a7769e913ccf054cd0cae008d19628bae12db27de96a99b5d6d29760b9d4
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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/strik?keyword=myopenmath+answer+key+college+calculus PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412606/normal_5f9825b9e9977.pdfIn PDF document text
    • https://dudazesulibo.weebly.com/uploads/1/3/4/6/134639231/c1cd183a66.pdfIn PDF document text
    • https://rajivuwos.weebly.com/uploads/1/3/4/3/134398668/2085872.pdfIn PDF document text
    • https://pevugubak.weebly.com/uploads/1/3/2/7/132740457/cfa6e37f0d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366632/normal_5f94b34beba4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368972/normal_5f89117116bd5.pdfIn PDF document text
    • https://liziruji.weebly.com/uploads/1/3/4/3/134380663/fufixesamawuja_xumad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/flos_clam_shack_yelp.pdfIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/famofifofos.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/vukamavejafuzux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/945fb32c-6abe-4881-a56d-28db56f070da/unix_network_programming_by_w_richar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61cd1928-0be5-4ce5-82b5-5c4b370f5072/19663859450.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73017570-d8c8-4bcc-9a50-8c3215e1e001/50_shades_of_darker_full_movie_in_hi.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/nofixazakidoduwadulobo.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/4_bit_adder_circuit_diagram_7483.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58a548d4-6352-44fa-9227-b271aea64698/grapes_of_wrath_movie_worksheet.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_off0000d5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AA 5612 bytes
SHA-256: e8784ebdd3d60a54b66474c5cf0597615d5392cae986d8d59292a8567067a0ae
font_01_sfnt_off0000e8be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BE 12708 bytes
SHA-256: e10a9db158f2f6beb62b0beb96e1567047e1871a4af0a55ebbd790e41c5b0bac

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