Malicious PDF — malware analysis report

Static analysis result for SHA-256 2936c37de6fcf199…

MALICIOUS

PDF

41.2 KB Created: 2020-11-08 14:16:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a1f383f93054d44700ffcc3cfd39132b SHA-1: 1f5faa6be5a72908b61d68b160518de201089b5a SHA-256: 2936c37de6fcf199fadbec4e4f7ececd7973aa7e1bac54ec171ee54b62ae0261
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • 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://trafffe.ru/aws?keyword=fishing+and+cooking+guide+wow+classic PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc7542da-d9e3-47be-a093-f0c05d7f1402/pepulotekesoveg.pdfIn PDF document text
    • https://pazeden.files.wordpress.com/2020/11/86767518253.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5be6b3d3-6fb3-4209-8bb7-a107ed60dc15/66799542249.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/194c0a0c-5b4e-4cff-b180-879d45c177cf/logudi.pdfIn PDF document text
    • https://foxidusiv.files.wordpress.com/2020/11/gulapif.pdfIn PDF document text
    • https://pefukiketez.files.wordpress.com/2020/11/lewarekelimakanozoko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4428a92-1716-48e8-a70c-ea559c67d667/buwurisuvaveraposajo.pdfIn PDF document text
    • https://wotenopofe.files.wordpress.com/2020/11/budixaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37aac9b4-f0ad-4c07-8c77-9d24bed7b296/54604708103.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/runukolisot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5aebae06-078f-4c4a-b889-7e06be6b9d44/58279368322.pdfIn PDF document text
    • https://dawaratuni.files.wordpress.com/2020/11/pazosepivomoralapoleduf.pdfIn PDF document text
    • https://zugipokojer.files.wordpress.com/2020/11/the_canterville_ghost_summary_chapter_wise_questions_and_answers.pdfIn PDF document text
    • https://rimofugu.files.wordpress.com/2020/11/71906757431.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a11d4295-52c3-4ad2-98a4-fdfe3838a769/defaxunokir.pdfIn PDF document text
    • https://s3.amazonaws.com/fenatagazise/37184462230.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_off00006363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6363 5216 bytes
SHA-256: dc33bd863c0d5f16258ee1798eeaf66a837c8982b8c7646f77f22a1789d7f027
font_01_sfnt_off0000753a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x753A 10248 bytes
SHA-256: cd710afb0ce78dedce8eba5a947c67e93cf54ae764c6961d463de98a8975ace2

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