Malicious PDF — malware analysis report

Static analysis result for SHA-256 90c8b66b65879368…

MALICIOUS

PDF

77.1 KB Created: 2021-06-06 22:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7bcd2891c01a9142c9c53502e66e3c74 SHA-1: 0f1aad5d6804b5f2e08570b22d4256f175e057ff SHA-256: 90c8b66b65879368fe7f134c8318f6932bd605777ee719405031f7463e605789
186 Risk Score

Malware Insights

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

The PDF file contains a link farm designed to redirect users to external sites, with one prominent URL suggesting a movie streaming lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, possibly exploiting PDF vulnerabilities or using JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://queure.ru/pbw?utm_term=assistir+depois+de+voc%25C3%25AA+filme+completo+dublado PDF link annotation
    • https://topemarepebide.weebly.com/uploads/1/3/4/3/134316461/2720460.pdfIn PDF document text
    • https://rimenedefogifu.weebly.com/uploads/1/3/4/4/134466040/romopebanelesar_bevire_xegeben.pdfIn PDF document text
    • https://nanapazux.weebly.com/uploads/1/3/7/5/137513245/konorularivewa.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/7c4524ef-72d3-4425-b61b-5429fdb54f60/pegofise.pdfIn PDF document text
    • http://nerobedevu.pbworks.com/f/alex_acheampong_song_ebebamu.pdfIn PDF document text
    • http://kekivozafiko.pbworks.com/w/file/fetch/144745122/vekogakolunuwote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8965ec36-ca32-4e5e-bcf2-83e127181d14/sadiwodovemepe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc678d18-0759-4b18-9288-b44ffc9a8337/mimijidekovelebiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf4e270d-589e-4216-9bf3-8e9f8d951502/11369220450.pdfIn PDF document text
    • http://kefimazusob.pbworks.com/f/wezabis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a6a0487-5945-4fbf-9bbd-857b410fd190/wacom_photoshop_shortcuts_not_working.pdfIn PDF document text
    • http://zipiwume.pbworks.com/f/facebook_friends_mapper_chrome_extension_2019_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df2564a6-71e7-4adf-9ae2-f1578a480bc9/61734042657.pdfIn PDF document text
    • http://kusarolox.pbworks.com/w/file/fetch/144513936/sonekujumororibavuwije.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a4b9428-cbb6-4ef8-98ca-6666c431d0a4/simmons_sd1000_electronic_drum_set_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed6a7620-57bb-4841-a041-b44bad6ca4ed/how_to_remove_dyson_dc44_battery.pdfIn PDF document text
    • http://xojipoxar.pbworks.com/f/tizagivokig.pdfIn PDF document text
    • http://zosajivapesi.pbworks.com/f/zosagowiwivixosopux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0f41d7d-bd4b-4c83-8123-1b7acd3cdb20/how_to_write_an_introduction_paragraph_for_a_personal_narrative_essay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fb27d91-2a5f-4675-8cec-8d89f134d799/73298468716.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14731cd3-5388-4f71-be6d-9462ae8d7029/dark_souls_2_boss_order_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24525c90-1aba-4601-94b6-59bc7fed55b4/30771716185.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_off0000eb01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB01 5640 bytes
SHA-256: 99965f6b8b376b1323e7d5817b747720b2bf0790cc81a52557af921789a037b0
font_01_sfnt_off0000fdd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD9 11208 bytes
SHA-256: c9be974641cf94ae97e1aab2b36c120187f65acd0b9e81d3fb4f24519bcdc68b