Malicious PDF — malware analysis report

Static analysis result for SHA-256 e93aa9aeb79aeaa6…

MALICIOUS

PDF

89.6 KB Created: 2021-05-16 06:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2da9cddbca1635333cebbcee89e2d021 SHA-1: 20ef7edd3317a1bd23f2f1e1adf160aa40158546 SHA-256: e93aa9aeb79aeaa6c765672213d4fa9538952af5347215511817b5a32965e58e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a significant number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM' and another as a 'PDF_SEO_DISPOSABLE_LINK_FARM'. The primary malicious URL identified is 'https://botokaw.ru/strik?utm_term=2020+camry+se+options', which is likely used for phishing or to serve further malicious content. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the link farm heuristic strongly suggests a deceptive purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://botokaw.ru/strik?utm_term=2020+camry+se+options PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/warapagefasovi/pronouns_worksheet_for_grade_1.pdfIn PDF document text
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_42526fef05e649af987e56eef3b27e5e.pdf?index=trueIn PDF document text
    • https://21319658-e817-4d6a-846f-872ccfe0f0c2.filesusr.com/ugd/982af2_8fe5290f2705493cbd5909583a60d935.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6cdff2c-2163-4192-89c7-f1b57263a05f/should_u_wash_your_face_before_working_out.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5ccc989-4797-43ce-adec-c200a5542018/9440189119.pdfIn PDF document text
    • https://ac65beef-1c88-4b01-a948-251493ed82f2.filesusr.com/ugd/09857b_00406a937a134225a743fa93cadf0238.pdf?index=trueIn PDF document text
    • https://e4034479-4ead-418b-af8c-5be8dc72bdbe.filesusr.com/ugd/1e8759_6d9d8f95e5c64e5b880ad5efdd221855.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/413ce83a-cd3f-4dfb-9b29-9b2df99d44ba/lotekosojumaxiti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fc60fe8-9f5f-4479-a199-81a24a776282/fonalegelemufivadu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b1138f9-bd0c-4133-8903-6d0def798eb6/how_to_cure_chicken_pox_scars_fast.pdfIn PDF document text
    • https://a0f88182-e1f9-4a9c-ba22-d5ce004c6985.filesusr.com/ugd/2f3216_b806fd28e5794a47bf96bcd02fb7bf81.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f4f7667-3c63-42dd-b860-dbc22f485c77/noxovitibebizezaderas.pdfIn PDF document text
    • https://e60c805d-b9e1-47fc-b045-983511e9ac1f.filesusr.com/ugd/116bb2_874db5bf88ee4a6491f262325d8adce8.pdf?index=trueIn PDF document text
    • https://fccd5518-64e1-462d-9dbe-8d8d8a19ca7a.filesusr.com/ugd/eb005d_7392265ae13546d2bfa4e6bd1664cb62.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1792235-35c6-417a-8813-1546f4f1f570/10591171299.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/inc_international_concepts_size_guide.pdfIn PDF document text
    • https://de2a8dfc-dc8d-4d62-be3b-f97abdd17bf6.filesusr.com/ugd/c722c2_3bf681ab2e2c407fb209320effccd704.pdf?index=trueIn PDF document text
    • https://be56f97b-0727-4a8e-a141-4155b83e75ac.filesusr.com/ugd/5034d0_cbba05cc79464bf8b62138ff93ccc531.pdf?index=trueIn 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_off00012336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12336 5328 bytes
SHA-256: 2dc23ca1e966f5115f9037a3914bbd3a2668e8f5e13de6dc85b15ee7076f7de3
font_01_sfnt_off00013540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13540 10692 bytes
SHA-256: e7a7897533d31a1844cd5efd4dfec9dddad8c6b508bcb20028e4226a94254d5e

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