Malicious PDF — malware analysis report

Static analysis result for SHA-256 044ab569d563a8f6…

MALICIOUS

PDF

43.5 KB Created: 2020-11-07 10:32:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 8cf644ae5b37fb61ad385e1117e24b62 SHA-1: 92f4a31df3bc16899824c790aafaf7a80349c96a SHA-256: 044ab569d563a8f6659825d9a2d648b4faceb62c72e62bc08201db8cd4a557b7
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous embedded URLs, with a high-confidence ML classifier flagging it as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for multiple links, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The presence of external URIs and the overall structure point towards a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://trafffi.ru/123?keyword=words+for+greatness PDF link annotation
    • https://nirawulef.weebly.com/uploads/1/3/4/3/134324477/2306830.pdfIn PDF document text
    • https://dofikusoru.weebly.com/uploads/1/3/4/4/134472045/wisukokewem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366364/normal_5f8829660c2c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413110/normal_5fa347c4a2d14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383702/normal_5fa29c73e04a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374022/normal_5fa5dc9bf1f05.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/e151e6f8-5234-4844-8eb1-59666261295f/remettre_pression_chaudiere_niagara_delta.pdfIn PDF document text
    • https://dunefufurux.files.wordpress.com/2020/11/wemugaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c6719c6-d7cd-4fe9-aebc-1b5b726221bf/ancient_chinese_mechanical_clock.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37f9785a-d19b-4de7-a9a3-e28d732f98e6/64363460362.pdfIn PDF document text
    • https://bomobaral.files.wordpress.com/2020/11/amor_loco_nunca_muere_descargar.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/tizuzagufevezaxiloxawoja.pdfIn PDF document text
    • https://bedaxabop.files.wordpress.com/2020/11/xagofenur.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_off00006afe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AFE 5056 bytes
SHA-256: 0882e03d258fbf9bee635c59e2e8d27b153ef30e7b082571ce515d3609a342ca
font_01_sfnt_off00007c4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C4C 10908 bytes
SHA-256: d08507bc95ba44a7cd39623a117a42bbe7d7ad6234c917c55128e4ca4f70f42d

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