Malicious PDF — malware analysis report

Static analysis result for SHA-256 4243aa6cf4ee74fa…

MALICIOUS

PDF

123.4 KB Created: 2021-01-23 05:12:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 9631d9fe9b147a2ed2bb0b40ba9c8dff SHA-1: e5a7852565a4622a97526e134acccf16294ba101 SHA-256: 4243aa6cf4ee74fa96ea043dc9fce18340a310c9bb545a6d6eb5a600411296b1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV detection and an ML classifier. It contains a large number of external links, indicating it functions as a link farm. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites. No scripts were extracted, but the PDF structure and numerous external links strongly suggest a malicious intent to lead users to compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://jacksth.ru/aws?utm_term=barbie+song+diamond+castle PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4464707/normal_5fc8af3c0abca.pdfIn PDF document text
    • https://cdn.sqhk.co/madumubo/drYQhgb/wordpress_ecommerce_templates_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/girewobo/Okhhgfs/33731643732.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367301/normal_600b6495c8433.pdfIn PDF document text
    • https://vexokefiveve.weebly.com/uploads/1/3/4/4/134494279/sipif.pdfIn PDF document text
    • https://dofazodasi.weebly.com/uploads/1/3/0/8/130873943/3206323.pdfIn PDF document text
    • https://cdn.sqhk.co/genizataxom/eydijL5/gorogadatukodasemiwisot.pdfIn PDF document text
    • https://cdn.sqhk.co/lerapuraroke/mgeibgc/92869682808.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501961/normal_5ff525625b5b8.pdfIn PDF document text
    • https://bobuwazubugomu.weebly.com/uploads/1/3/4/4/134494734/9534137.pdfIn PDF document text
    • https://cdn.sqhk.co/zetanitanedo/SStuggM/gravity_rush_ps4_game.pdfIn PDF document text
    • https://cdn.sqhk.co/juvexafi/jiPOXB7/ladedosonopiz.pdfIn PDF document text
    • https://dofazodasi.weebly.com/uploads/1/3/0/8/130873943/2a826ab92314.pdfIn PDF document text
    • https://cdn.sqhk.co/weruvewo/iifhcih/neo_usd_news.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366952/normal_600b7593dce10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490380/normal_5fecbbf4e184a.pdfIn PDF document text
    • https://xikipavukageza.weebly.com/uploads/1/3/0/7/130776529/titibimopu-bewebevej-lefuxidawome.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386607/normal_5fee152c6c18e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366325/normal_6004c24bd13e5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0001a7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A7FE 5448 bytes
SHA-256: ae0b2d0fbb73dd104357c57b1ff0f30baab659de152e5b558ef550b03400aaa9
font_01_sfnt_off0001ba6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA6A 11172 bytes
SHA-256: 006d1cbefc92f4f49452e0b527c2f8f86637ee3768d44671c5561396055090cc

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