Malicious PDF — malware analysis report

Static analysis result for SHA-256 25f3b2e9edaa3723…

MALICIOUS

PDF

65.9 KB Created: 2021-05-31 15:01:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: e95e60dc9283b7e148809b9612f3d4d2 SHA-1: 8359acd6c6e3a52d2aac7e513952eafca2d8125f SHA-256: 25f3b2e9edaa3723f4ae723e9c3cb1a942a1153bfa0057f1c0238b57a94e6996
226 Risk Score

Malware Insights

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

This PDF document functions as a link farm, directing users to numerous external PDF files hosted on various domains, many of which are disposable. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates that the document likely instructs the user to decrypt or access a password-protected archive, a common tactic to bypass security scanners. The presence of ClamAV detection and ML flagging further supports its malicious nature, suggesting it's a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ponafet.ru/strik?utm_term=renewable+energy+master+plan+pdf PDF link annotation
    • https://gobajirosalafos.weebly.com/uploads/1/3/5/3/135392744/ace6c85d35e.pdfIn PDF document text
    • https://jigejoxipivigif.weebly.com/uploads/1/3/4/7/134731155/fexawim_tutunuxu_vorokif.pdfIn PDF document text
    • https://wesiravanenuje.weebly.com/uploads/1/3/4/3/134385991/7812266.pdfIn PDF document text
    • https://zojopufowe.weebly.com/uploads/1/3/4/5/134523349/jebenurupaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484370/normal_603a24709e59b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500904/normal_6069a19616dca.pdfIn PDF document text
    • https://wivapofeselaf.weebly.com/uploads/1/3/5/3/135317026/5836966.pdfIn PDF document text
    • https://zizobisorodevu.weebly.com/uploads/1/3/5/9/135964877/643968.pdfIn PDF document text
    • https://kadezejuvi.weebly.com/uploads/1/3/4/6/134603763/givawinesunilux.pdfIn PDF document text
    • https://wulijubinewi.weebly.com/uploads/1/3/3/9/133997189/wuzididiribamuji.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4460045/normal_60aff38a573e4.pdfIn PDF document text
    • https://rugomekedakore.weebly.com/uploads/1/3/5/3/135302214/5852004.pdfIn PDF document text
    • https://vefubonipit.weebly.com/uploads/1/3/4/7/134719522/4892184.pdfIn PDF document text
    • https://naletonuve.weebly.com/uploads/1/3/4/3/134381452/kusekuku.pdfIn PDF document text
    • https://rojomitalo.weebly.com/uploads/1/3/4/4/134485393/jedavijo-romijefenujif.pdfIn PDF document text
    • https://nidozasa.weebly.com/uploads/1/3/4/6/134680612/6865373.pdfIn PDF document text
    • https://nodizolubuta.weebly.com/uploads/1/3/5/2/135297944/sorovitedovos_soxapejuzowali_jasutevu.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/9d356b23-6780-4669-85ec-c47e64205a82/bazowapupe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f80e070d-a23f-42aa-8590-94806b4bb36e/57544026687.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15ed863c-cf01-46e2-8221-e34e048066a3/traductor_espaol_ingles_con_voz_gratis_google.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/331b80c7-8667-4d49-bd90-285f179a0952/15108216448.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_off0000c47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC47E 5704 bytes
SHA-256: dd1d1a92155678e67559d518ad9b0f2d7d730735e343c6dfe7976ec3b6cfde9b
font_01_sfnt_off0000d7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7ED 10052 bytes
SHA-256: 528a1282b3f6fe67f5e7a9b5e487b38520a991f7fed6e92db0013511d9ab30a0