Malicious PDF — malware analysis report

Static analysis result for SHA-256 0523c7e09aa8080d…

MALICIOUS

PDF

74.5 KB Created: 2021-03-16 19:21:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 85ecbb621212b9c0865e9424dbc8934c SHA-1: c977cb7cf69ed7af5215a606f932236ccd040e61 SHA-256: 0523c7e09aa8080d88493a53e1adc080ada76b1ebabe6810272457604a5a80f0
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm designed for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://xezojetit.ru/wix?keyword=arc+the+lad+trophy+guide PDF link annotation
    • http://1xbet-sportstavki.fun/recarga_facil_vivo_numerol5rby.pdfIn PDF document text
    • http://opticsystem.website/chores_planner_template7p0ip.pdfIn PDF document text
    • https://cdn.sqhk.co/daxozazon/jg4DSif/best_weather_stations_for_home_uk.pdfIn PDF document text
    • http://spindlndou.space/download_driver_vga_foxconn_g41mxe9349d.pdfIn PDF document text
    • https://nivumumati.weebly.com/uploads/1/3/4/7/134703955/bijonamizesafil.pdfIn PDF document text
    • https://rapowude.weebly.com/uploads/1/3/1/4/131454581/numafe.pdfIn PDF document text
    • http://idealslimitalia-ufficiale.site/momifefofologozaxazex2rp04.pdfIn PDF document text
    • http://astrology-personal.online/world_war_1_questions_and_answers_quizlethrjuu.pdfIn PDF document text
    • https://xifexovajebim.weebly.com/uploads/1/3/0/7/130740184/f1bd3689f9d31.pdfIn PDF document text
    • http://nubolats.xyz/muwejbam37.pdfIn PDF document text
    • https://juxilejaguzu.weebly.com/uploads/1/3/4/4/134404551/putepuzepuvujevop.pdfIn PDF document text
    • http://nominasacra.ru/86314484940quo.pdfIn PDF document text
    • https://cdn.sqhk.co/kelopifagisu/ghCjdij/ice_cream_sandwich_cake_recipe_with_pudding.pdfIn PDF document text
    • https://cdn.sqhk.co/mojupesonon/helChfO/21057688053.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e0eedba4-cf99-4c42-97f5-d3f9ae5832dd.filesusr.com/ugd/e36ea7_2568bfc8b8fc45f2a25be54914713c1f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muvarelo/84225807867.pdfIn PDF document text
    • https://a694a867-b0fa-45cd-b082-7f9abf80b1a7.filesusr.com/ugd/430cb2_7ae979b7e2a84568b673b2fc0dd79cb5.pdf?index=trueIn PDF document text
    • https://c216880a-03a2-4774-ab7e-121c93799e8f.filesusr.com/ugd/b5aed9_65614e853912468a95b28ab227a93844.pdf?index=trueIn PDF document text
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_4c644089b07b4c788a758f4735155308.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jezobasit/kodak_esp_office_2150_printer_installation_software.pdfIn PDF document text
    • https://s3.amazonaws.com/woxotopapozokev/menteri_pendayagunaan_aparatur_negara_dan_reformasi.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_off0000e5eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EB 5248 bytes
SHA-256: 1987c992d0f48b1ea5336d2061ca6afa4a2aca95c70057fa76a75a50ed62e83f
font_01_sfnt_off0000f7cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CC 10880 bytes
SHA-256: 4d2fd465af35d2d41d7f15212eb8d4d637e1f4f1c346713eb568088b0b8df094