Malicious PDF — malware analysis report

Static analysis result for SHA-256 55321e4bebf5e507…

MALICIOUS

PDF

72.6 KB Created: 2021-05-30 05:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 80a89e0951021884295495e63c0cd726 SHA-1: dca267e3776cabf19152a11e7bddd18d86205b16 SHA-256: 55321e4bebf5e5075f548e20af5416d0fa913b7dd4366156bfe69a09c76a12c2
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dugedepap.ru/123?utm_term=simple+coming+soon+html+template+free
    • https://ruvawigalovenu.weebly.com/uploads/1/3/4/3/134318686/90cc6aaf75d.pdf
    • https://xisaxori.weebly.com/uploads/1/3/5/3/135324705/5495700.pdf
    • https://lonewarole.weebly.com/uploads/1/3/4/5/134593790/d47daf17cfdc647.pdf
    • https://kidisizim.weebly.com/uploads/1/3/4/8/134899836/xamabilofir_gomeru.pdf
    • https://cdn-cms.f-static.net/uploads/4391893/normal_604b1e6cc646b.pdf
    • https://goromezamoko.weebly.com/uploads/1/3/4/7/134753948/fidusin.pdf
    • https://cdn-cms.f-static.net/uploads/4490264/normal_60209a699fb1d.pdf
    • https://cdn-cms.f-static.net/uploads/4422877/normal_605f73f9df27c.pdf
    • https://gifetapajuloper.weebly.com/uploads/1/3/4/6/134682222/pexelugeb.pdf
    • https://sodipojemip.weebly.com/uploads/1/3/5/3/135325099/8724876.pdf
    • https://zekilunadaxidub.weebly.com/uploads/1/3/4/6/134631079/sukekon.pdf
    • https://cdn-cms.f-static.net/uploads/4475997/normal_60313563e4c8b.pdf
    • https://cdn-cms.f-static.net/uploads/4405181/normal_6063467218c89.pdf
    • https://wofefuveti.weebly.com/uploads/1/3/4/3/134348775/6757929.pdf
    • https://kusudojisopev.weebly.com/uploads/1/3/4/7/134774064/9564140.pdf
    • https://cdn-cms.f-static.net/uploads/4404297/normal_601e882d0510e.pdf
    • https://cdn-cms.f-static.net/uploads/4378641/normal_60405dd3b454c.pdf
    • https://xonuvalax.weebly.com/uploads/1/3/1/4/131437330/witirako.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b1e10d0f-46c2-4054-960e-cf8a1f47abb1/gulifovi.pdf
    • https://uploads.strikinglycdn.com/files/e9f18ea2-3354-4eb6-92e6-46df9d6122b7/modelo_de_carta_poder_simple_para_realizar_trmites_bancarios.pdf
    • https://uploads.strikinglycdn.com/files/ad1f5bef-bb4f-4472-af1c-0992c21e0eac/tudanegekamugaj.pdf
    • https://uploads.strikinglycdn.com/files/0640d0ed-18fb-4d0b-82b1-0f16a5c0c7a7/jolegoxotomigatevibajin.pdf
    • https://uploads.strikinglycdn.com/files/b639fb1a-cd70-4da7-a509-84b04b369e46/mi_planta_naranja_lima_completo.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_off0000df76.bin
4deb5951de9631067b0294ae21fd8c53f8776a30dff5cb664cf392bf0502ef6c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF76 5532 bytes
font_01_sfnt_off0000f222.bin
4fd01b6e6fc23c418bfec629761a69b43e1a1e5b5392ce8662d95fdd495d9d7b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF222 10308 bytes