Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b59ab28c1e0d23…

MALICIOUS

PDF

82.2 KB Created: 2021-03-23 04:37:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: cd35d6a16d299d07a599d2addfaccaad SHA-1: b5014b45b9b3cbcf4eee79df5a41c7040c390c5f SHA-256: f8b59ab28c1e0d23e9420502b95a4f8a9274e50c2e06bd60304ea0dd84be72ef
244 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and exhibits characteristics of a malicious redirector link farm. It contains numerous embedded URLs, with at least one pointing to known malicious infrastructure. The document's structure suggests it's designed to funnel users to external sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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
  • 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://dafemum.ru/award?keyword=arteriografia+mesenterica+pdf In PDF document text
    • https://cdn.sqhk.co/posaleren/ggA12jd/islanders_vs_lightning_game_3.pdfIn PDF document text
    • https://popaxeras.weebly.com/uploads/1/3/0/8/130814769/684544.pdfIn PDF document text
    • https://gojatoxemoniro.weebly.com/uploads/1/3/4/8/134894745/jivejuxozo.pdfIn PDF document text
    • https://cdn.sqhk.co/lomasamube/Ohciigi/cara_auto_reply_whatsapp_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/sadopore/jhiMeih/41544819208.pdfIn PDF document text
    • https://kowexemi.weebly.com/uploads/1/3/1/8/131872048/gadoliboxosopog.pdfIn PDF document text
    • https://cdn.sqhk.co/setawigiz/7hbVmFA/free_images_for_desktop_background.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://54957a25-093b-4cbd-a4f0-8eb5fea931f0.filesusr.com/ugd/8ba634_d4eb94f253dd48c2818bdd5fc25d24d2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb016ee0-8b3c-401c-b9b2-b3ec0dcc5e22/california_real_estate_principles_15th_edition_free.pdfIn PDF document text
    • https://436010f1-0dd7-4950-aec0-3bdf337573e8.filesusr.com/ugd/5a4c69_a8e8f01656684083b65ae637463a02eb.pdf?index=trueIn PDF document text
    • https://dc58184e-bbba-402a-8e08-a55d552c8f3f.filesusr.com/ugd/0ebc1f_8b03d113b2854d1ca27e5ebba3a604e3.pdf?index=trueIn PDF document text
    • https://fa90eb46-aa9b-4fd1-a2e8-e903ec8e50a4.filesusr.com/ugd/575fb0_5b7009fb83434e688ca869ed17778dc9.pdf?index=trueIn PDF document text
    • https://234d5d8d-19c9-4cab-a884-dd0775662658.filesusr.com/ugd/fb7225_840acb11444d4affaf393d29ba212870.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/10629872578.pdfIn PDF document text
    • https://39c3e2ba-dcb8-4bc0-9ed7-0058f02c59d5.filesusr.com/ugd/fd4c29_adf7efb02fd74bb4b44b3cb8484dad5e.pdf?index=trueIn PDF document text
    • https://7e005a1c-fb68-43c1-af83-b854b6a2d282.filesusr.com/ugd/dcfb95_de2de0d1d1604f36a012553ab6c1c695.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nowokil/javawe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8edeac3-3483-402a-bc25-0a30cfffdbfe/47326056369.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1a8ac76-a7db-4bb1-98c2-137e9018b6da/referenceerror_request_is_not_defined_node_js.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagobomap/babur_mughal_empire_information.pdfIn PDF document text
    • https://1eb42bdc-3da6-4b32-b75f-4382f1721f8e.filesusr.com/ugd/35474d_ec3169a9a1ed4f47bac96f590eea2e3c.pdf?index=trueIn PDF document text
    • https://67536400-2f23-40e2-9d3a-36ae3f4dfb8c.filesusr.com/ugd/5312ea_3283e77ad61a4e51bfc73652c0ace8fc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/integrated_chinese_level_1_part_1_lesson_10_workbook_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/baby_g_shock_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccaf1843-67a5-460f-960d-5efb91893fe2/76804837642.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/febcd6e8-6718-4c61-ad2f-16d819e1db88/83611582279.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_off000100eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EB 5432 bytes
SHA-256: 95ad46606ca85ec1fbe9277fbd1e52ddbcf9ee42561add1e663cede875cb60ba
font_01_sfnt_off00011358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11358 11768 bytes
SHA-256: 104850ad3f00e0d35338ae13c745118230bb4b38f0163275451afeb93e062667

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