Malicious PDF — malware analysis report

Static analysis result for SHA-256 de9421498e5983c3…

MALICIOUS

PDF

79.6 KB Created: 2021-03-24 15:43:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b891f1b5c49fbe43feaf94e674160111 SHA-1: c3c913170dd1dd194b63be9b5a604bfafa32fd0a SHA-256: de9421498e5983c3592e150b9f2375240bc35f251d9830ca01b274b7f697ffcd
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO spamming operation. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of numerous URLs suggests a potential for redirecting users to malicious sites or downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/strik?utm_term=how+to+run+a+socratic+seminar PDF link annotation
    • http://fofumumitem.medianewsonline.com/36374451824.pdfIn PDF document text
    • https://tamegafatukof.weebly.com/uploads/1/3/4/4/134400059/nikazuwakuvoka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413835/normal_600fe95cf3a77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382782/normal_602827155254c.pdfIn PDF document text
    • https://mejotozoferu.weebly.com/uploads/1/3/4/8/134866749/7397560.pdfIn PDF document text
    • https://tikodukika.weebly.com/uploads/1/3/0/7/130776738/9970938.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383565/normal_5fcbdb30a9d05.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nakogis.myartsonline.com/jelokidubanoto.pdfIn PDF document text
    • http://vibejasejejake.epizy.com/jibapapekum.pdfIn PDF document text
    • http://fujuresaw.epizy.com/python_django_template_if_statement.pdfIn PDF document text
    • https://c1e70603-6ca1-47bc-880b-b60d7d434995.filesusr.com/ugd/df625d_191d7722e4a74cda8385f731792fc2fe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/50235688213.pdfIn PDF document text
    • https://27a83426-c768-4525-a63d-b5b732cca755.filesusr.com/ugd/28b3f7_38161bd8b57d41e8888cab704296617d.pdf?index=trueIn PDF document text
    • http://gozidonozali.myartsonline.com/zepuku.pdfIn PDF document text
    • http://lugorigarotari.epizy.com/weriz.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/lilimabugikele.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/state_employees_credit_union_open_on_saturday.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_off0000fc60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC60 4968 bytes
SHA-256: ad371b346f9e8d9a1bce78ed93c880ebf92358cbeb590738344fa82796ff59b8
font_01_sfnt_off00010d3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3B 10176 bytes
SHA-256: fdb9f6aad068fdacd42200936a9cede00f42387d3ac60f424c558592ff40c901

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