Malicious PDF — malware analysis report

Static analysis result for SHA-256 aea9200205a88453…

MALICIOUS

PDF

77.5 KB Created: 2021-03-05 04:02:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e0b9b675b9e0e3e4ac07d890eec46c48 SHA-1: f6a0ffe36302243161e49f28877d25e1d8384893 SHA-256: aea9200205a88453ded18f9ad44af854450ab3dbfa56fa80d65d0f7f7fe14db8
244 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The document contains a large number of embedded URLs, many of which point to disposable hosting and appear to be part of a link farm. The primary malicious URL identified is https://yafferge.ru/strik. The presence of these links suggests an attempt to direct users to potentially harmful content or phishing sites.

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/strik?utm_term=how+to+prepare+for+sat+vocabulary In PDF document text
    • http://lodomujimujug.mywebcommunity.org/how_to_start_internal_audit_of_a_company.pdfIn PDF document text
    • http://gekifek.scienceontheweb.net/how_to_reboot_samsung_tablet_4.pdfIn PDF document text
    • http://gamowenugeg.sportsontheweb.net/english_grammar_check_reverso.pdfIn PDF document text
    • http://haustova.com/5216789116bwdjy.pdfIn PDF document text
    • http://winoorama.site/nigiwamefetamosewadovipewtn8z.pdfIn PDF document text
    • http://wefilevazobakeb.mypressonline.com/plan_de_negocios_sencillo_plantilla.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/c5c73afa-188a-437c-93a3-ae2f42799aea/what_is_the_best_recumbent_exercise_bike_for_home_use.pdfIn PDF document text
    • https://3dbd840c-7861-42b4-b064-af52d1d2f4eb.filesusr.com/ugd/86319b_d29c90049f594e1b8dfbf816cb9a8bd7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7d69bf7-125d-4269-9efb-40edb9fc8f7f/sadoweki.pdfIn PDF document text
    • https://cc46d2ba-e7cf-42f8-aa62-b015a0c17ef0.filesusr.com/ugd/d180c3_98fd9f4ee788442f9a687802f4caaa61.pdf?index=trueIn PDF document text
    • https://85fc0914-20e3-4f1c-be8c-de7e6f89f47e.filesusr.com/ugd/a44510_d94d9d5f6b33496d88658f2b49652d1c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ebfa914-0388-411f-a0dc-2847c4360503/jandy_pool_heater_jxi400n_manual.pdfIn PDF document text
    • http://bonitadobizaw.epizy.com/sesowonojuzijura.pdfIn PDF document text
    • http://mukubalevi.rf.gd/wufulejekojox.pdfIn PDF document text
    • https://170d08c7-2527-4f8e-8bc4-cf7f6ffab704.filesusr.com/ugd/afe24e_fdc5828c56e8468192ef7f07c352d0bf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7daa58d-df8d-4499-b3dd-0c56656d637d/apa_format_list_of_tables_example.pdfIn PDF document text
    • https://a7474f5d-6ec7-41e4-954d-8cb0a6a0c5ec.filesusr.com/ugd/b987d2_4b97063e6b114ada97484e7213af3168.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/72863653-165c-4870-a762-549c0215d862/how_do_you_calibrate_a_vizio_tv.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_off0000e5e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E0 5092 bytes
SHA-256: 425fbad7fed42ce0ffdb24dba6ed033d121b0c2c57e1a4cdec36d9e7cd6c0344
font_01_sfnt_off0000f75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75F 10248 bytes
SHA-256: 30418e6b7b5ed950cd0960d98ce4f6b5c46ca264c0529cd5d26574fcf3386348
font_02_sfnt_off00011a84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A84 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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