Malicious PDF — malware analysis report

Static analysis result for SHA-256 75aa73dbdd75cff2…

MALICIOUS

PDF

42.0 KB Created: 2020-11-06 05:07:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: a522febc2c95d723f8101cfc7dad017e SHA-1: 976b9703671eede5e5fcfd2fac21f369f0744eea SHA-256: 75aa73dbdd75cff24658b8a6b156e5a25b45a965f7bb62d2c23c58d41d1d433b
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://traffset.ru/123?keyword=blockchain+wallet+apk PDF link annotation
    • https://vozutububedem.weebly.com/uploads/1/3/4/3/134372478/3927529.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464877/normal_5fa2231e891b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378628/normal_5f8e9dddaf115.pdfIn PDF document text
    • https://vefozifus.weebly.com/uploads/1/3/4/3/134382693/zijosifawexemetokel.pdfIn PDF document text
    • https://gorigopaf.weebly.com/uploads/1/3/4/3/134341526/fisavipodob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373016/normal_5f8d5aba37ede.pdfIn PDF document text
    • https://fuparududewon.weebly.com/uploads/1/3/1/8/131856041/pupapefujeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404953/normal_5f95977d9dc63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393348/normal_5f9ca75b1fd0c.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/bizamesuwepe/generac_automatic_transfer_switch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8981e0e5-f5ba-4b09-9b72-e2b6bbdfbcbf/der_eisendrache_bow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40feee84-53f4-4266-9aac-60aaad6fd46e/52353094293.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d05f10e4-8565-4224-9570-01d5a97f9210/gipitesozefomeramesaxabe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/242735a7-7dab-4c4b-bebb-3802ca8a9684/87476718856.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af93038a-a9f5-4b53-9433-e301e99ba9b1/angel_a1_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec6a1a7d-af9c-4883-b94c-0f42e11c9691/jeduniwat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bef65d10-5a95-4d62-8c98-39f33bea19d1/python_programming_in_context.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_off000065b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65B2 4952 bytes
SHA-256: 3aea2f9d0d7dd5e803910b2c045381672dcdce8974e18ea33982df67c0fd080a
font_01_sfnt_off000076a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76A0 10776 bytes
SHA-256: 146af0e4020882c03ace1895aeaa5a45d46de7576320abf0be3c5699fd3f7db5

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