Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcd2a8cdf5a52aed…

MALICIOUS

PDF

60.0 KB Created: 2020-11-12 20:27:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a20c15d85ff2156af761dc0bbd5169ce SHA-1: 29a6761ce3580c0332296bfb45761c36a310a85a SHA-256: bcd2a8cdf5a52aed27f43507498620723ce54d2054d8a881a725950bf5c7620a
156 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 ClamAV and 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 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafficel.ru/strik?utm_term=super+smash+bros+brawl+for+android PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388611/normal_5f8e07c74d284.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388285/normal_5fa61755e43a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375887/normal_5f8ea0588bc0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383692/normal_5f9101d8b090c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415322/normal_5f9b9a1a651b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387586/normal_5fa27c5812b8a.pdfIn PDF document text
    • https://kutusavirub.weebly.com/uploads/1/3/4/2/134265758/wawofos.pdfIn PDF document text
    • https://nudojafobedem.weebly.com/uploads/1/3/1/3/131379550/4290719.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/32da3b98-eb22-4aaf-8f41-3a5c261ff0c6/tesomozabode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02417302-de87-436b-bfaf-70cbc58e80ed/pusigafinazelarimita.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/teriyan_deedan_song_download_mp3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/503e57fc-15d1-46b5-82e0-c86dbcb53f94/12474913215.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7b5176a-038b-4445-8969-cae0c5ed2578/high_yield_cell_and_molecular_biology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4372bae2-7e1a-48aa-922c-787d916ae449/bobupame.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_off0000b11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB11E 5616 bytes
SHA-256: 6f3b1a6b40586243c7ba3a6cce46d0bf7cd84065266f0b07b4bdf12bf1c66ffb
font_01_sfnt_off0000c412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC412 9144 bytes
SHA-256: 7d9fa8aef8f05deeeb36d114b6729f58394bcf916e5c748562bd27409408488b

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