Malicious PDF — malware analysis report

Static analysis result for SHA-256 87728e7caa7da3ee…

MALICIOUS

PDF

71.4 KB Created: 2021-02-06 20:29:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: c33b1804940baeddbb5531b6bc4e515a SHA-1: 6e6d3cef921fd7e33745d073bf00a4fcd6630b73 SHA-256: 87728e7caa7da3eeb95efdc4a3c57b55f1ce48fae1c7d7cf7e3082c6fbe11f3d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a link farm designed to direct users to other PDFs. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://baarspo.ru/123?utm_term=five+wishes+online+free+pdf PDF link annotation
    • http://rubisteq.online/fizar4fzii.pdfIn PDF document text
    • http://goodnaturak.space/671714546204awy9.pdfIn PDF document text
    • http://startbastar.online/acellus_easy_sign_inergsw.pdfIn PDF document text
    • https://bovidekomuburo.weebly.com/uploads/1/3/5/3/135312485/715703bef6d6fcf.pdfIn PDF document text
    • http://meetchat.space/ps4_vr_horror_games_gameplaybavpw.pdfIn PDF document text
    • https://wibugosavuzatug.weebly.com/uploads/1/3/4/3/134349607/soberilemino.pdfIn PDF document text
    • http://yewes.space/vidmate_2018_app_videosxfx7.pdfIn PDF document text
    • https://donurufeto.weebly.com/uploads/1/3/4/8/134898164/5916d05c0008855.pdfIn PDF document text
    • http://instapresent.site/mukitoviro6lhnn.pdfIn PDF document text
    • http://kapusta.pro/anemia_falciforme_y_paludismoesee4.pdfIn PDF document text
    • https://betutoza.weebly.com/uploads/1/3/4/8/134899773/2786913.pdfIn PDF document text
    • https://gofolepoxi.weebly.com/uploads/1/3/4/8/134882907/3157919.pdfIn PDF document text
    • http://help-copyrighteamservice.com/login_touch_n_go_ewallet2ss9x.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/petubapizo/spark_python_vs_scala_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/nitirew/transunion_credit_report_phone_number_spanish.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/rasagudenitivugemugibe.pdfIn PDF document text
    • https://s3.amazonaws.com/lumixi/iphone_photo_icloud_error.pdfIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/school_building_plans_and_elevations.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/33295396889.pdfIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/chain_of_custody_form_pnp.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/android_carplay_mazda_2.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_off0000dab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB8 5024 bytes
SHA-256: 98d8ec163a470c29e431bd2c4fd40617d8a2804b9135d869ff3029eb4ad002ee
font_01_sfnt_off0000ebe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE4 10652 bytes
SHA-256: 0870d4046f9e08ae7bedb5094a9573f9ff45481d35dcdf24fc9e34fcd82d4b3b

Open this report in the interactive analyzer, or submit your own file for analysis.