Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e87ac01d7866249…

MALICIOUS

PDF

75.1 KB Created: 2021-01-16 13:30:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 4c101ce78af417af56b629aa6a69be03 SHA-1: 9c9cd1b9419d932741b615f4acde560ca95a7e07 SHA-256: 3e87ac01d786624965885a0d8cc0e4f256be8c611c417bd61bbf8ec6e3fa7bcc
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified as a link farm, with many pointing to disposable hosting. This strongly suggests a phishing or malware distribution attempt, leveraging the PDF as a lure. The ClamAV detection and ML classifier further confirm its malicious nature, likely exploiting a PDF vulnerability to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://traffine.ru/aws?utm_term=bloons+td+battles+mod++ios PDF link annotation
    • https://cdn.sqhk.co/fisejadiruw/hbia9m9/49758460430.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448551/normal_5faa52e0164a5.pdfIn PDF document text
    • https://site-1178096.mozfiles.com/files/1178096/72227278982.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384644/normal_5fe8f0fe24110.pdfIn PDF document text
    • https://site-1174856.mozfiles.com/files/1174856/famebawovatig.pdfIn PDF document text
    • https://site-1181071.mozfiles.com/files/1181071/17566697705.pdfIn PDF document text
    • https://site-1176337.mozfiles.com/files/1176337/after_we_collided_world_release_date.pdfIn PDF document text
    • https://teribizekejuxes.weebly.com/uploads/1/3/5/3/135391999/2030691109d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417318/normal_5fd830a80991b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377391/normal_5f8b77198cf00.pdfIn PDF document text
    • https://site-1168308.mozfiles.com/files/1168308/jutite.pdfIn PDF document text
    • https://siviwoxepigomuz.weebly.com/uploads/1/3/0/7/130739754/027af276b.pdfIn PDF document text
    • https://sugasukeni.weebly.com/uploads/1/3/4/8/134878852/35d2bf8ab0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387571/normal_5fb8875a867b7.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_off0000dffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFB 5064 bytes
SHA-256: 0c570a9be75496c00c649e4ecb6c801f9e99b79760849e7c1f3630102f6b2631
font_01_sfnt_off0000f123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF123 18184 bytes
SHA-256: 424759dbb0b8a4746285eac54fa387d484514542b195e6500aafd20493b853de

Open this report in the interactive analyzer, or submit your own file for analysis.