Malicious PDF — malware analysis report

Static analysis result for SHA-256 496a36cfc5ed6c25…

MALICIOUS

PDF

95.9 KB Created: 2021-02-21 14:52:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9c19cf22703c123a5fab0b53b8061863 SHA-1: 6c786e798e16b00c6fa4052c3029d4ad9d4e53d6 SHA-256: 496a36cfc5ed6c25504eb32ab39a7f21c9bac722d9c65d16991d4f5f56808fdc
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting and are designed to redirect users to potentially malicious sites. The document body, though heavily obfuscated, appears to be a lure related to an 'Onkyo tx-nr709 manual pdf', suggesting a phishing or SEO spam campaign. The presence of a malicious redirector link and the ML classifier's high confidence score indicate a high likelihood of malicious intent.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/aws?utm_term=onkyo+tx-nr709+manual+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4470014/normal_6022a1c257ab2.pdfIn PDF document text
    • http://intekzafast.online/leviroxuwuwilun476u2.pdfIn PDF document text
    • http://baranaydin.org/alif_se_full_hd1080p_video_songyqqn8.pdfIn PDF document text
    • https://cdn.sqhk.co/dokijesu/iU2hhgd/move_the_block_slide_puzzle_apk.pdfIn PDF document text
    • http://faceskinagainbeauty.xyz/povufisizoguvrpalw.pdfIn PDF document text
    • https://bagirarivevi.weebly.com/uploads/1/3/1/3/131384609/falisuvi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459324/normal_5fd742863f50e.pdfIn PDF document text
    • https://zedimubaxujejit.weebly.com/uploads/1/3/4/7/134715534/pesexa.pdfIn PDF document text
    • https://nerilumasufut.weebly.com/uploads/1/3/1/4/131437044/afaa2d1c9876680.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450898/normal_5fd32a0f59376.pdfIn PDF document text
    • https://sirukume.weebly.com/uploads/1/3/0/8/130814715/ruroj-wekumomoz.pdfIn PDF document text
    • https://sixutaxujarupi.weebly.com/uploads/1/3/4/8/134882582/c9cf2d8597.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/nazekisigiduz/zeruri.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/alone_movie_songs_pagalworld.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/contractor_contract_template_nz.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_off00013ad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD3 5680 bytes
SHA-256: 729a51708d4b1d61c1c648b950f84403d22e63f8f84dff2c83624616775e0084
font_01_sfnt_off00014e2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E2C 10708 bytes
SHA-256: bea7c901cd5b55331a57a7c5cba3b0642c1e1fcc8d1ba9f2d4e7b6843e9fa4a9

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