Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dd4274b9ced3456…

MALICIOUS

PDF

81.9 KB Created: 2021-04-03 17:13:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 069e98266d80157bb63560c2e963a474 SHA-1: d1ee2cc5f40a0f1c77429706e7deaa1210e5d51a SHA-256: 3dd4274b9ced3456e8ab5a145510fa758fc3129bb50c7f8fb32f63773edfa4bc
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links pointing to domains that appear to be part of a link farm, hosted on disposable infrastructure. This is indicative of SEO manipulation or a distribution point for malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

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 http://arthromedshop.xyz/mecanica_vectorial_para_ingenieros_estatica_beer_johnston_10_ediciono3qoc.pdf In PDF document text
    • https://cdn.sqhk.co/vivokunavu/ahgijjf/12041810763.pdfIn PDF document text
    • https://cdn.sqhk.co/sirojenu/diiXKhe/3d_printed_maze_box.pdfIn PDF document text
    • http://nesobaka9.xyz/93964609017q3t57.pdfIn PDF document text
    • https://cdn.sqhk.co/wiradimabid/hgjighE/farm_clash_3d_reckless_pvp_shooter.pdfIn PDF document text
    • http://myfavoritesun.xyz/rabobejowikidumikapiwhczub.pdfIn PDF document text
    • https://cdn.sqhk.co/kevejonob/dgjCibc/wukatisorowiranabasilova.pdfIn PDF document text
    • http://selectgetc.top/walmart_photo_center_appointment2434m.pdfIn PDF document text
    • http://zdorovienashevse.xyz/whats_the_difference_between_dyson_small_ball_and_big_ballpbmd3.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • https://cdn.sqhk.co/xenaporo/OtQjdud/crazy_pumpkins_carving.pdfIn PDF document text
    • http://bizbize-yeteriz.org/pdf_books_free_download_websitesffctx.pdfIn PDF document text
    • https://cdn.sqhk.co/sipebesoxu/CbT1ghp/everfi_module_5_credit_scores_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/wejawujagi/jn3ihic/download_lagu_alan_walker_faded_instrumental_version_mp3.pdfIn PDF document text
    • https://cdn.sqhk.co/vagofedewat/aggeijU/7385392854.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/G1IkLG9TFNM/wb?keyword=what%20does%20it%20mean%20when%20a%20guy%20always%20winks%20at%20youPDF link annotation
    • https://c809e8a6-5bdf-489d-8d8c-df4e4638a115.filesusr.com/ugd/45a296_55e790a623df43c993141732893ed5b9.pdf?index=trueIn PDF document text
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_3f882fcfbf7a46efba627a80f8544bf5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/48735937-a601-4f66-954c-b777469ac17e/52424906336.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbc6099b-1dcc-47f2-b8e3-220e3c27a07b/toletax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/628bceba-8aa3-4c8a-881d-c0a2c333c5af/two_way_radio_programming_software.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_off0001033a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033A 5416 bytes
SHA-256: 2a3f53a545a1915ad2982fe9cf6d7491c42813d1adbb6d6e9cd37a87b65127d0
font_01_sfnt_off0001159e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159E 10552 bytes
SHA-256: 7d0874b203aebdaee8802b53670a05c92d35b4b80f3f947cd82d5500b539ef96