Malicious PDF — malware analysis report

Static analysis result for SHA-256 64ec718eda1d59bd…

MALICIOUS

PDF

70.3 KB Created: 2020-11-26 13:53:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: b557a648295b869d0793d151b49a6d3a SHA-1: 1ccb08bd2665af1bf8f0728108f26eb0253b2085 SHA-256: 64ec718eda1d59bd115f836b701384ac218bbb002e894a0899f3da4ba4138670
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a significant number of external links, many pointing to disposable hosting services, which is characteristic of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or SEO abuse. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://trafffe.ru/strik?utm_term=sugar+syrup+for+bees+autumn PDF link annotation
    • https://zisokilusativ.weebly.com/uploads/1/3/2/3/132303079/c2126804ad26.pdfIn PDF document text
    • https://zifizegesug.weebly.com/uploads/1/3/4/7/134719454/lufor.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/5d6f2da.pdfIn PDF document text
    • https://nixawajumumija.weebly.com/uploads/1/3/4/3/134338940/jijur-viberisege-xabibu-taxub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418796/normal_5faeed1db07a7.pdfIn PDF document text
    • https://pazijovipa.weebly.com/uploads/1/3/4/3/134327002/1830700.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378613/normal_5fbb11418b8a6.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/3d5bbf02-41d4-48d7-9773-444779378d49/words_that_have_oi_in_the_middle.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/business_plan_outline_template_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44a82cac-8157-4958-827f-8f1fb801cf94/82173529299.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/html_to_converter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f921575f-dc43-49a3-90c6-0a79ebc6bfd8/mamumusipakonutukev.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_off0000ca40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA40 3516 bytes
SHA-256: ad40d888d183bb826ac3379831dffc85884a90602a988da84d59bb240d4d3698
font_01_sfnt_off0000d6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CF 5532 bytes
SHA-256: 3d8ed660f792c8ae9b643045acbbe38f37d3ac67a8f370b3236d4be5ab26c34c
font_02_sfnt_off0000e996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE996 10252 bytes
SHA-256: 823cbec9a79600024d15aaf18b4e115a3f7560dfbd5f19439833593fcbf04e76

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