Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ad6eaae8201c294…

MALICIOUS

PDF

65.2 KB Created: 2020-12-19 10:58:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 42d06b9c513640915b7a7174a873a00e SHA-1: 981c7d69c5ab733eda891b3c36a8ade3b48615d3 SHA-256: 3ad6eaae8201c294f6f6e1c372f2dd89ec237f35e85816d312a0845642cb8309
186 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 ClamAV and 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 0.9998

Heuristics 6

  • 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 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://traffset.ru/aws?utm_term=guidelines+for+uncomplicated+lower+urinary+tract+infections PDF link annotation
    • https://pezopipowom.weebly.com/uploads/1/3/1/4/131406060/nabiwedax-xapadarik-rovegofevejiju.pdfIn PDF document text
    • https://vesixogis.weebly.com/uploads/1/3/4/8/134863987/e6fd86ec47d4587.pdfIn PDF document text
    • https://polirafula.weebly.com/uploads/1/3/4/5/134528493/3034682.pdfIn PDF document text
    • https://nelemiken.weebly.com/uploads/1/3/4/7/134704654/8954714.pdfIn PDF document text
    • https://lumuvimusu.weebly.com/uploads/1/3/4/7/134719948/munudupif_xenalib_sufonowofiz_mofizolibovex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f3c109e-beb8-41b1-9b39-b00dfbcdb848/35996402045.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/742cab9d-7c34-482e-aef3-a22cc94d6b4c/judonelumokaxibo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3183e108-6814-49e8-9f46-f6552fca922a/kuredamaduwodapo.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/bioconjugate_chemistry_book.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc052d83dfdd95b60d21819/t/5fc149acf81c9a2a0cd17b8e/1606502828797/88766131529.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/dr._ali_biology_book_for_neet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11aa1406-527f-4858-a474-1d19577e23de/pearson_geometry_textbook_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65dbd8ad-b733-44ac-bd73-ee1ff945c390/dozosagetusetun.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_off0000c434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC434 5524 bytes
SHA-256: ae7e3259770dfeecc6cfcda88a94b750e3acb55a02dfe96accee76844940f947
font_01_sfnt_off0000d6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FF 9568 bytes
SHA-256: 1f2effc89b7d13401578cbd2b5dfc5065e2bd3dc7b7b7408761d593d55ca8361

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