Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b7281e49413f76f…

MALICIOUS

PDF

69.8 KB Created: 2021-01-07 20:43:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9efaff282850155304cf51ddbc61b4d9 SHA-1: ba8a7bc2f42e8ee566697762443ccb5f29536c00 SHA-256: 9b7281e49413f76ff53fa1567e0fb626dc53b4dc88297b0bf5e5ef1ba0a28716
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used for SEO poisoning or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to drive traffic to potentially harmful URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffnew.ru/aws?utm_term=mortgage+calculator+google+spreadsheet
    • https://static.s123-cdn-static.com/uploads/4492892/normal_5fe3ee5f53e4f.pdf
    • https://jesokalatozu.weebly.com/uploads/1/3/4/5/134591365/ribulo.pdf
    • https://cdn.sqhk.co/kulizuxekume/0qnZYLo/tiny_planets_pc_game.pdf
    • https://cdn-cms.f-static.net/uploads/4471509/normal_5fdc23b91e671.pdf
    • https://xukonixivuki.weebly.com/uploads/1/3/0/9/130969652/noxekojobujima-xetunasam-karetolakutokid.pdf
    • https://cdn-cms.f-static.net/uploads/4489441/normal_5fb60cffcbef5.pdf
    • https://cdn-cms.f-static.net/uploads/4425514/normal_5f99878893af3.pdf
    • https://cdn-cms.f-static.net/uploads/4381289/normal_5f923b5014309.pdf
    • https://cdn.sqhk.co/lerutefo/RXUgdhi/sujuzadogir.pdf
    • https://cdn.sqhk.co/pimibopugugo/hcYMnig/scoop_it_bowl.pdf
    • https://cdn.sqhk.co/dufukeraj/3y8jfoG/8912609621.pdf
    • https://cdn.sqhk.co/nerenina/2b6Q2hd/sejososujegotidogetoroguj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f58481e4-3824-404f-8f7d-95d3f80f1ce8/waxima.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d165.bin
f1ad32c4a31bfef24a94b56724bb88aa72e5b4754dbfec7117f14463aa32d227
pdf-font-stream PDF embedded font (sfnt) at offset 0xD165 5340 bytes
font_01_sfnt_off0000e391.bin
c4dcd421c145b56edd0652b93a97565b578785f606d4ff404b729e6925baeff0
pdf-font-stream PDF embedded font (sfnt) at offset 0xE391 11260 bytes