Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4ad09619549c498…

MALICIOUS

PDF

64.3 KB Created: 2020-11-23 04:10:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 3af5a9b8feb3fcbf20c4e4ce3496e8b8 SHA-1: 93e4159a625b8fb04be7f09bdb09a91572032655 SHA-256: f4ad09619549c498e5b7d7148955fb52c528dfd31620660e2148c013f13ea54e
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO spam or directing users to malicious sites. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to potentially harmful content, possibly leveraging document body text as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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/123?utm_term=amazon+fire+tv+cube+2nd+generation+manual PDF link annotation
    • https://bitujidup.weebly.com/uploads/1/3/4/5/134598072/jumituvaw_tovaparep_sozuxewob_vutugamikeruj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449775/normal_5fa6e88ce5445.pdfIn PDF document text
    • https://pebezudaxefen.weebly.com/uploads/1/3/4/3/134347708/5416213.pdfIn PDF document text
    • https://binufigelivu.weebly.com/uploads/1/3/4/7/134775083/mixepilifoduvuw.pdfIn PDF document text
    • https://vodexekuteb.weebly.com/uploads/1/3/0/7/130776001/6903866.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/778585b8-0576-4f23-98ba-c6b00ea01761/vobufuvatamurizewo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9456756e-2bcf-4e8f-b5b1-1188e26dfd54/vojegadowokuzalosuti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f60e0443-ee45-47e8-a1a6-0e6f91e77912/dupli_color_paint_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba83ffda-cd97-4a93-8627-1b6de9ed6579/darker_el_james_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2715d6a8-f346-46a1-98b1-eefffe792fca/vox_nicholson_baker_read_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05fbfd1f-c1b2-48ed-9a50-de5b70553291/padebibogufidivexuli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7f52d00-11b4-465b-a793-8cdc64b900d4/gululidilanof.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_off0000bed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBED2 5536 bytes
SHA-256: 01661ad1dbd65e0e20afcac9d7d3d9889c31af3ce7d794fd7d70d480b9abcf1c
font_01_sfnt_off0000d19f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD19F 10132 bytes
SHA-256: cc93e3d0e07a0d051c9fd019ba42891b64b078fa62ed52548c25afe10c5bd2d7

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