Malicious PDF — malware analysis report

Static analysis result for SHA-256 4de0b5cbb6738c7f…

MALICIOUS

PDF

56.7 KB Created: 2020-11-06 04:59:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 3d92dd79c1b683afcfae4652cd474c60 SHA-1: d49206e660fe4320134132a5572b1d06daeea8f8 SHA-256: 4de0b5cbb6738c7ff9b01663e666daab748f80683bbda4e0b8f201a51816297b
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://trafffi.ru/123?keyword=commedia+dell+arte+mask+zanni PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426679/normal_5f9c65541a2ef.pdfIn PDF document text
    • https://bozofuki.weebly.com/uploads/1/3/4/3/134322044/2dc9b42fe683486.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383702/normal_5f93bf0967188.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425511/normal_5fa283b282f28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367281/normal_5f8dd9c563e8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386337/normal_5f9d19dd42753.pdfIn PDF document text
    • https://vefozifus.weebly.com/uploads/1/3/4/3/134382693/wabezowutuven.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/0e506a33-5a09-4565-8d4b-5a4fd3ad55e6/vetafulemigonuxu.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/wuwug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79bd0ca3-9e27-4cf1-91f6-8a18a2293c28/15864268499.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/sanowutasabigurodunowe.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/asme_section_ix_2017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a300f69-23ee-45e7-aff1-33ae1b24e54d/xinilujo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000870a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x870A 3120 bytes
SHA-256: 16a0685b1af8f7ff3286410c82d065b2ef9dd16f5cc5e004aadb0dd239daad33
font_01_sfnt_off0000923d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x923D 4896 bytes
SHA-256: fbe9f88438001c74f10cb548a1afcbe0cbbc8669c5b37c4d1a1856b141c5df66
font_02_sfnt_off0000a2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA2CD 10756 bytes
SHA-256: de6cf15d23926c4d6c882b9fceee59deb6fb6c50ae6e0ff0b0d645440fa7cd70
font_03_sfnt_off0000c734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC734 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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