Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbf145792642a539…

MALICIOUS

PDF

77.8 KB Created: 2021-04-01 03:31:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea773e88e30ca9c121044790342b8141 SHA-1: 24fcc935728999102e73238946112da1c2cc7cdb SHA-256: dbf145792642a5392dcbd20be916dbc568c0005ff3abc860478cbe7e496b4dd5
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_LINK_FARM heuristic identified a large number of external links, suggesting a link farm designed to redirect users to potentially harmful content. The primary IOC is the initial URL which appears to be part of this redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xajibur.ru/award?keyword=adenomiosis+uteri+adalah+pdf
    • http://lovelyhouse.online/what_is_the_best_lay_z_spaieugn.pdf
    • http://thehensleys.org/surah_mulk_recitation_with_urdu_translation_mp3ncore.pdf
    • http://lovemecompletely.com/disovarawavevopazufumakitt55tv.pdf
    • http://natural-shop.info/lirukudasofaw87fai.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bodirinukamole.onlinewebshop.net/wejajepozora.pdf
    • http://wovuluvoju.onlinewebshop.net/causas_de_acidosis_y_alcalosis_respiratoria_y_metabolica.pdf
    • https://uploads.strikinglycdn.com/files/e99d9cf9-b752-429e-98af-718f0999c3da/nodasejobanufatezoxigo.pdf
    • https://s3.amazonaws.com/risalenefazozo/70809356883.pdf
    • https://s3.amazonaws.com/bezegoluzose/87005999564.pdf
    • https://uploads.strikinglycdn.com/files/f9a46002-e5e5-4764-9f68-98e048de3629/brinkmann_smoke_n_grill_stainless_steel.pdf
    • https://uploads.strikinglycdn.com/files/4f2956cb-c963-4a02-ba45-cd344fdc0b6f/cloud_security_alliance_questionnaire_xls.pdf
    • https://s3.amazonaws.com/mejigavukolu/67598354385.pdf
    • https://48cc712b-de5e-493e-a198-f8962849e22b.filesusr.com/ugd/d2751c_01c1b14eef8542e185ee80cc0a339627.pdf?index=true
    • https://f78a7b13-e75c-4ddc-9f3c-03cd83736f6c.filesusr.com/ugd/90c53f_4e1b6079815540f795c77070fd07ed51.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e850e157-e87f-4f7f-a45c-f00030af891b/jukime.pdf
    • https://s3.amazonaws.com/somisilegex/ley_contra_acoso_laboral_puerto_rico.pdf
    • http://bumurulepowele.myartsonline.com/how_do_you_change_your_voicemail_number.pdf
    • https://s3.amazonaws.com/tolivajupeku/the_rosie_project_plot_summary.pdf
    • https://s3.amazonaws.com/tipikaxe/magejasubediw.pdf
    • https://6db1e9a2-4282-4636-8d41-de07325ad911.filesusr.com/ugd/d97b38_9bde7fd975654256bcf21008c0fcdba7.pdf?index=true
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_af13b4352a3140e5b1a375493e847e07.pdf?index=true
    • https://s3.amazonaws.com/zodererezuzuxi/fasijubomizeto.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f584.bin
01955a739a1b6df2a9d0e3fd4e2f27494a53be45e7f449efd6d930fcb36f0f69		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF584 5268 bytes
font_01_sfnt_off0001073c.bin
ddd66111830b04b67af4ea819ac02103ac4b097c3e78a53c1ba0d1aea3cf8ece		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1073C 10060 bytes

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