Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b90474d9188b4b2…

MALICIOUS

PDF

94.2 KB Created: 2021-02-16 12:24:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 847525daf6539a3cddf5ba35c77e906b SHA-1: 202db9a68b63f8365c3184b5aecacdbd55f1023a SHA-256: 3b90474d9188b4b2c0ad6fd161e541d19e3e259f8e5931a2b25436d2f5f3b845
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for a link farm containing 30 external PDF links. The ML classifier also returned a high confidence score for maliciousness. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest an attempt to redirect users to potentially malicious content or for SEO manipulation. The primary IOCs are the external URLs found within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/strik?utm_term=how+much+do+contract+law+attorneys+make PDF link annotation
    • http://minomesiguziv.22web.org/usb_iso_software.pdfIn PDF document text
    • https://cdn.sqhk.co/xigofidiw/jdhdXQT/ates_ve_su_3_1001_oyun.pdfIn PDF document text
    • https://cdn.sqhk.co/fevivesuxofo/ROgfIMQ/lg_tv_remote_control_android_app_download.pdfIn PDF document text
    • https://cdn.sqhk.co/xefilelo/VgfXFyv/sejetax.pdfIn PDF document text
    • https://cdn.sqhk.co/nudavede/qgcLRqp/centurylink_phone_number_to_pay_bill.pdfIn PDF document text
    • https://cdn.sqhk.co/kufiremikaf/oUUgcJV/repizelejeb.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/g3Mggji/39298974463.pdfIn PDF document text
    • https://cdn.sqhk.co/repudodo/igUhchc/free_download_mountain_car_drive.pdfIn PDF document text
    • https://cdn.sqhk.co/furafurume/BjjjaL2/margherita_pizza_vs_pepperoni_pizza.pdfIn PDF document text
    • https://cdn.sqhk.co/mabisurud/izhfigT/32457011918.pdfIn PDF document text
    • https://wipabobape.weebly.com/uploads/1/3/5/9/135985954/fipak_pinarirexilow_segenosizenumen.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/gifojuxaxeva/android_developer_guide_notifications.pdfIn PDF document text
    • http://legolipif.epizy.com/blob_file_in_javascript.pdfIn PDF document text
    • http://lemujiv.epizy.com/background_png_hd_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/trust_deed_template_nz.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/abcd_tamil_movie_songs_free_2012.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/brownies_uniform_shop_guildford.pdfIn PDF document text
    • http://kawobos.rf.gd/97392719061.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_off00013222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13222 5396 bytes
SHA-256: 01ae70cf7e18962d574de8bf22c55768ba5474db58c6ec8480eb6dcc88665c43
font_01_sfnt_off00014463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14463 11360 bytes
SHA-256: 90ad4592a0221a84414ae64ee563a71456ceaf8010d99759ea654a62ad149d73

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