Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6db1cc23b830bb9…

MALICIOUS

PDF

87.4 KB Created: 2021-03-22 20:00:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: dc56aa42280dfca7148a8748aa5eb87b SHA-1: c040a41bec65be28ddefa3ae26b5053ac17fb1a7 SHA-256: b6db1cc23b830bb93169d3fdbcde0ea23a6498d1ebf3699711a172f090721bc2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically pointing to 'xajibur.ru/award', suggesting a phishing attempt to trick users into visiting a malicious site. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of using disposable hosting for link farms, further supporting the phishing lure. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xajibur.ru/award?keyword=behavioral+decision+theory+pdf PDF link annotation
    • http://sitizinudex.getenjoyment.net/gonexinif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486535/normal_5fd64661f012a.pdfIn PDF document text
    • http://botanilix.mygamesonline.org/ias_zoology_syllabus.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417319/normal_5fcf7e2616f34.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d64d5b41-a66a-4b78-b87f-0feaf8e9cf76.filesusr.com/ugd/cf1aed_5629e82520a749f3afab14f57d921d89.pdf?index=trueIn PDF document text
    • https://006b50d4-ad2a-4261-8279-34542eb0d7b0.filesusr.com/ugd/a640e9_578422ee710c4fbd925a27c710df974a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xoferuzu/royal_bengal_tiger_picture.pdfIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/the_belgariad_book_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a07615fc-3f53-47eb-b001-7f5971344c40/diary_of_a_wimpy_kid_14_book_collection.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3999ff13-4cef-4e63-b946-80ee1d58ea63/mejunironeder.pdfIn PDF document text
    • http://dupepoge.onlinewebshop.net/sunbeam_heated_blanket_microplush_10_heat_settings_garnet_full.pdfIn PDF document text
    • https://a21f0d7d-5fe0-4a99-a381-3b18266e0880.filesusr.com/ugd/6c313a_262d598bc0de4d6aa03ee66096a7e1ad.pdf?index=trueIn PDF document text
    • https://e25b5f36-ee09-4010-8803-019b2853a23b.filesusr.com/ugd/c34eac_9ff5a50e5893450bbd1109bfb6eac49b.pdf?index=trueIn PDF document text
    • https://804b95bc-9ca4-448d-a094-5a8e1ff69a26.filesusr.com/ugd/99d1da_a56ef1723cd04e82a92b0d75a25ec979.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sefepugolupalax/vomijiloroje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7555a406-0734-4dc0-be9c-30057586327a/58966109335.pdfIn PDF document text
    • https://6c49ff76-e13b-46da-8354-2e633d56f736.filesusr.com/ugd/211c2d_8e7d36de22ac4427adc113d622d2231f.pdf?index=trueIn PDF document text
    • https://e6c529cc-411f-4195-b5ea-7b5fd081490a.filesusr.com/ugd/b7ab08_931b9afc290248cba66f594e95868e60.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_off00011881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11881 5452 bytes
SHA-256: dc6ce22d0cc29804649373d06ee91e8243d9170e0b84ac2f0362a245ff155a8e
font_01_sfnt_off00012b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B14 11408 bytes
SHA-256: b4a9bfd06cf943e4d43177914cedc4537214d962b8132490384023598811e1e2

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