Malicious PDF — malware analysis report

Static analysis result for SHA-256 f86cbf6d4852135a…

MALICIOUS

PDF

65.3 KB Created: 2021-01-15 01:59:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: da1fc6fbb87069fad04588e7167652f5 SHA-1: d39485e12bc42bbeed7a4d4dafb62be76b998faa SHA-256: f86cbf6d4852135a9df3099a1fd8a71fdd2d5994cf0752bd1591386ebf6857d1
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external links to other PDF files hosted on various domains, some of which are disposable. The primary purpose appears to be SEO manipulation or distributing further malicious content through these linked PDFs.

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://trafftec.ru/123?utm_term=dichotomous+key+worksheet+middle+school PDF link annotation
    • https://riwisasivituw.weebly.com/uploads/1/3/1/0/131070703/f45658a.pdfIn PDF document text
    • https://cdn.sqhk.co/mewowoji/ighhLhh/61007189852.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481831/normal_5fcdd21bdeced.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410722/normal_5f9f0428cda3e.pdfIn PDF document text
    • https://getiwojaxewife.weebly.com/uploads/1/3/4/0/134012456/76f6be81b6d0dc8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480382/normal_5fda43b103fc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369508/normal_5fa18b3423ba3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483851/normal_5fa791b0456f7.pdfIn PDF document text
    • https://kidubaviputotej.weebly.com/uploads/1/3/4/5/134520398/rowol_lazilesotodi.pdfIn PDF document text
    • https://site-1172403.mozfiles.com/files/1172403/majijolenugijulosenebo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484632/normal_5faf11ace3caa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375525/normal_5ffc6494dde59.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/45695217877.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_off0000c5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B3 5228 bytes
SHA-256: 3f60205dbd5c5ee806a1c067c6d0872f093e296264b6d672589d2fe81cf2c8d1
font_01_sfnt_off0000d76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76C 9692 bytes
SHA-256: 2d0447709b1fca27b54ba6918eac30b3573093103d14484e93ea52b6327f6962

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