Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa0d1535665bb57a…

MALICIOUS

PDF

79.1 KB Created: 2021-04-03 17:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 1f07b8af8eaf98c027958130fe2ddbcf SHA-1: bd678106e54062bf9677e7a724c9649492e43fb3 SHA-256: aa0d1535665bb57aa122c432a060aa25b7cd149fea8f05691295ad240fbfa6b2
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the PDF structure and numerous external URLs point towards an attempt to leverage external resources for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://jumiwimov.ru/123?utm_term=free+capitalization+worksheets+middle+school PDF link annotation
    • https://jokineviraxara.weebly.com/uploads/1/3/4/2/134265776/6cf02342aa9.pdfIn PDF document text
    • http://prizinsta24.site/pirates_of_the_caribbean_at_worlds_end_flute_sheet_musicguvem.pdfIn PDF document text
    • http://rcasino.info/kumon_books_grade_3_australia2daye.pdfIn PDF document text
    • https://munemajof.weebly.com/uploads/1/3/2/3/132302982/xodanav-zulezenewik.pdfIn PDF document text
    • https://sozazajigosana.weebly.com/uploads/1/3/0/7/130739782/5f406b9052f3d1.pdfIn PDF document text
    • https://pegufozexak.weebly.com/uploads/1/3/5/3/135317465/99725f8e3f0a5.pdfIn PDF document text
    • https://xaweworamek.weebly.com/uploads/1/3/4/6/134610398/ef172be.pdfIn PDF document text
    • https://kepubaxolawava.weebly.com/uploads/1/3/4/7/134703856/wakutonulugadejisep.pdfIn PDF document text
    • https://memebewaliz.weebly.com/uploads/1/3/0/7/130775997/kuwiburimazelam_newokar.pdfIn PDF document text
    • https://namosupegu.weebly.com/uploads/1/3/4/3/134313644/5322837.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/0a7640e6-d710-4b03-b591-09c70106e85e/ruzetezanevodugafot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b480699-4e28-4b40-a5d7-50ad7de159dd/tulenuriwasafinitowari.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83a0c6f3-3d48-4de2-923f-ed2c2e7b6fbb/savetejabalaregoxaxaf.pdfIn PDF document text
    • http://dozuxix.myartsonline.com/81389159.pdfIn PDF document text
    • http://kojenixerog.myartsonline.com/95221628276.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/544b8d65-ab1d-4790-9438-32d3d291ba0b/kunadiwot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67513001-9fc2-4d98-8e2e-bb3b315e3a0d/how_to_do_a_beer_advent_calendar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7426f578-942c-4190-a108-ba320e0559d4/english_to_bengali_converter_software_free_download_for_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f58e127-e819-4373-a7fa-fba6fd88858a/dd_dark_sun_video_game.pdfIn PDF document text
    • http://forezepolutaju.onlinewebshop.net/vuwawutizoxo.pdfIn PDF document text
    • http://xuxerutiwuv.onlinewebshop.net/benefits_of_virtualization_in_cloud_computing.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_off0000f7a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A2 5476 bytes
SHA-256: 49172bb04ef8f58b0fa74bec2a94596436f817f9c4841066f021520c673ca61a
font_01_sfnt_off00010a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A30 10696 bytes
SHA-256: 0d54f59d3d786bf57eddf5c14f17226e4c8bb66bfd4692329bdf55a4cfb3c191