Malicious PDF — malware analysis report

Static analysis result for SHA-256 24394cd48e171c83…

MALICIOUS

PDF

32.7 KB Created: 2020-11-07 01:17:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 521177c3b6cc1dfb326739cc264cce70 SHA-1: b618446423a94eefc3b48608b57a444b1add8c3a SHA-256: 24394cd48e171c8312ff2f7b3baf3e77a08728a1ee4979e9f45a63793f88690b
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://traffine.ru/123?keyword=arctic+king+instruction+manual+for+acfm035bdw PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365600/normal_5f875e69d1c6a.pdfIn PDF document text
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/8710724.pdfIn PDF document text
    • https://gozivuwedigati.weebly.com/uploads/1/3/4/6/134612943/fda83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412592/normal_5f96c15f9f5a3.pdfIn PDF document text
    • https://babinekisifuve.weebly.com/uploads/1/3/2/6/132696104/megumex.pdfIn PDF document text
    • https://rujogapojepon.weebly.com/uploads/1/3/4/5/134597846/6673348.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368228/normal_5f876ad750847.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://tojovaw651389336.files.wordpress.com/2020/11/sebuwurupo.pdfIn PDF document text
    • https://lofakuserizo.files.wordpress.com/2020/11/82587977016.pdfIn PDF document text
    • https://mutozofe.files.wordpress.com/2020/11/67728004733.pdfIn PDF document text
    • https://tilokas.files.wordpress.com/2020/11/74634430094.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87e69630-2a7f-400f-8742-9bcd34280979/12214139411.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33f1a60b-8245-44c7-b370-d4345c775a76/47591689843.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_off00004248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4248 6056 bytes
SHA-256: 55043c237e7606882bd20d18bf17b90ad01f23224a14e311c7f27b7258379877
font_01_sfnt_off000056e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x56E5 9192 bytes
SHA-256: 1d66768bd98ac4494934feede9bba3671aa76ec5543b71371356631bf7f94331

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