Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ae72cfcb98f49c…

MALICIOUS

PDF

29.5 KB Created: 2020-11-06 10:09:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: be1e164dbf5db607456b70825c07b848 SHA-1: bd717c2a1a554779a854e47f9ea569799d880696 SHA-256: 66ae72cfcb98f49c343375ccee170315fd1bf07e7c2d14b2b9f605f114e066c4
116 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF is identified as a malicious image-only document designed as a lure, containing a click-outward action to an external URL. It also features a link farm of 20 external PDF links, suggesting a coordinated effort to distribute malicious content or engage in SEO manipulation for malicious purposes. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent.

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.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 29 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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=accidentes+geograficos+video PDF link annotation
    • https://pepisukuwen.weebly.com/uploads/1/3/1/6/131606293/xowosekanejepok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424328/normal_5f9d08d690c0b.pdfIn PDF document text
    • https://jawowigo.weebly.com/uploads/1/3/0/7/130774982/fufuvik-mivojakulapuzon.pdfIn PDF document text
    • https://fisotewefupug.weebly.com/uploads/1/3/1/0/131071176/ximoxusuwi.pdfIn PDF document text
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/ludozewowonufalo.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/0c8ec135-746e-4cf0-a20b-e544584d6ad0/dr_nowzaradan_diet_program.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0470790-4f8a-4d96-bc77-55a1fd5b5608/guilt_shame_and_anxiety.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22abbc0d-b9b8-40e3-bdfd-0a657c35a464/passe_compose_exercices_et_corriges.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/484eadd2-1825-4c97-9fa1-4eb32d448296/gisudunitobaguv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ed708eb-0c44-4de7-9224-fba7a13a4f69/ergobaby_omni_360_manual.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_off00003c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3C43 5208 bytes
SHA-256: 033f7eb43f27828b3ab498573911a3792cd03c171383220c49bbec27567f8f86
font_01_sfnt_off00004e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E11 8552 bytes
SHA-256: 59e25cd83e6797260b016b9933898d4d84ccebe694f0cb439e1c22135738fea9

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