Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb563e93e9c701f6…

MALICIOUS

PDF

53.8 KB Created: 2020-11-07 13:05:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 865d6be592f8d172d1e07eae125f1081 SHA-1: d8db20b215e37e6831ad3e9af56a942e424e9e3f SHA-256: fb563e93e9c701f66947cec3dd84bce6e995c848f752953cd18e1b6c1300813b
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 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://traffine.ru/123?keyword=frog+and+toad+are+friends+pdf+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4389568/normal_5fa542793c873.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/3968299.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418755/normal_5fa4c5c9ba4d6.pdfIn PDF document text
    • https://sipexagugiresu.weebly.com/uploads/1/3/4/6/134607427/donebaxeduse.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412767/normal_5f9e7682ee392.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428054/normal_5fa37e91e17e1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/tafimixomaluxunigerupavid.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/89490021888.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/electron_configuration_chart_cl.pdfIn PDF document text
    • https://s3.amazonaws.com/divikufifir/kingroot_apk_in_uptodown.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_off00009039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9039 5256 bytes
SHA-256: 9d87b3c4d3dbe3739aa3819b76ea967f287de87411ad156a1d9b3d519f83e270
font_01_sfnt_off0000a247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA247 12704 bytes
SHA-256: 324196c9684ffa7837d31b64dbd36fe7cf1adfc2387dd3b2319e91db1e8957d1

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