Malicious PDF — malware analysis report

Static analysis result for SHA-256 491da8076b386b54…

MALICIOUS

PDF

69.6 KB Created: 2020-11-24 18:44:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: d656457d5336106ff4560c7c7789ee33 SHA-1: 3511adc1f63628e90b9f434ed76859a9584cee5e SHA-256: 491da8076b386b54fa505c594c692d6132924fc006d8d47a9e6fee9f9a7488e8
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, and it contains a significant number of embedded links. One critical heuristic indicates the PDF links to known malicious redirector infrastructure, specifically 'https://cctraff.ru/aws?utm_term=stomach+exercises+at+home+video'. Another critical heuristic identified it as a PDF link farm, with 'https://jilibawijoza.weebly.com/uploads/1/3/4/3/134363321/gisomutinom_tobafopimasuk.pdf' being one of the initial URLs. The presence of these links suggests an attempt to direct users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://cctraff.ru/aws?utm_term=stomach+exercises+at+home+video In PDF document text
    • https://jilibawijoza.weebly.com/uploads/1/3/4/3/134363321/gisomutinom_tobafopimasuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372100/normal_5f92376cf176b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413980/normal_5f9a05c41b7a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365576/normal_5fa2eb5213f64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384299/normal_5f922d5e9aede.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/896eda07-57c3-4b01-a272-41d297472fb6/prepositions_of_place_worksheet_intermediate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d75e6d1e-de28-4afc-9681-06c800ac9710/kodosive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6109c64f-8331-47dd-8d9d-ede44c1fe0ff/stryker_t2_femoral_nail.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04e3da60-a05f-4c39-bb21-77dedfc9f783/6770199778.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa24f108-7c4e-42b8-8cdb-65e88aad68e6/badamukupez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ac1851b-26d4-46e1-b3a6-151ed45424da/lufasitegaberuzed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95a328f2-e783-4ddd-b12c-4289ea2811ca/motion_for_modification_form_georgia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/797d7609-a356-4f7c-a96e-5bd41dc925ec/dukiduzopofabaw.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_off0000d3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E8 5376 bytes
SHA-256: bebd3a2924820f8f1e43d601f779b3ab95b18b6677f7b5f82694faead4a31caf
font_01_sfnt_off0000e609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE609 10488 bytes
SHA-256: 75d5a01465528f3ad02e916ffa0021dafc5d560f6292d7da74476f45be6db265

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