Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb9dd38b6b2cc5d5…

MALICIOUS

PDF

77.2 KB Created: 2021-02-27 04:08:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f74dea90acd1a2863e975b0a129951f1 SHA-1: 95b14a1ac54060cdb1cfe88a9ae72ef4f54c75f3 SHA-256: bb9dd38b6b2cc5d5f6a547379f1e369eb46f6e0c6837a546b74d0baa1e520e9f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://jacksth.ru/strik?utm_term=vitamix+5200+us+sale PDF link annotation
    • https://jufavufopu.weebly.com/uploads/1/3/4/3/134340263/3d69778926.pdfIn PDF document text
    • https://cdn.sqhk.co/fakosopalo/hia2idG/turtle_beach_gaming_headset_xbox_1.pdfIn PDF document text
    • https://xewulatejema.weebly.com/uploads/1/3/5/3/135345986/3399298.pdfIn PDF document text
    • https://cdn.sqhk.co/putizimetiwe/ieJNV0R/nixozepawexutuk.pdfIn PDF document text
    • https://cdn.sqhk.co/vabalogu/dfjavih/rojurakupakal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379626/normal_60291da0091e6.pdfIn PDF document text
    • https://vojesegavosoza.weebly.com/uploads/1/3/0/8/130813146/segaz.pdfIn PDF document text
    • https://wuxuvekukiku.weebly.com/uploads/1/3/1/3/131380251/zogowovanob-luzazurukokigi.pdfIn PDF document text
    • https://dajidavibaral.weebly.com/uploads/1/3/4/6/134606929/ed6e2a8692605.pdfIn PDF document text
    • https://cdn.sqhk.co/gogefaman/eK5WZO3/widonutazufatumanejud.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/vavejijitatofu/abbyy_transformer_2._0_crack_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40B 5168 bytes
SHA-256: dbe8c6c2552c5464bb6397771197c3b682dd9d8d47e7a5902478242731df0ad5
font_01_sfnt_off0000f594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF594 2916 bytes
SHA-256: 16ffc3465914f82bd735e1f0f4067853f5d344191389b62fde1cefb0ec818111
font_02_sfnt_off000101e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E6 11288 bytes
SHA-256: 716ff080fda3fc01dece7c4f517b8bd1164d73611a5ed2742ec600de188fe2c6

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