Malicious PDF — malware analysis report

Static analysis result for SHA-256 f325f9055e88bf92…

MALICIOUS

PDF

97.3 KB Created: 2021-04-08 17:33:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c869ee7c3df217ebdbae92e0c7309b0b SHA-1: cb3c50e682359805697e1835bbbc16690e97364f SHA-256: f325f9055e88bf921f2562a3e45cbda315e6eecaf32fa543fa71e530543e2264
136 Risk Score

Malware Insights

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

The PDF contains a heuristic indicating it's a lure for free downloads, leading to an SEO redirector. The primary IOC is a URL associated with this redirector. While no scripts were explicitly extracted, the PDF structure and the nature of the lure suggest potential for embedded malicious JavaScript or other exploits to facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jacksth.ru/strik?utm_term=twilight+render+free+download+sketchup+2015 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4464851/normal_5fde49b5b9b40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389107/normal_6039794fa72bb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416500/normal_5fc7f05e2344e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419629/normal_6009697f77c8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369914/normal_6029c6df8d627.pdfIn PDF document text
    • http://kezijego.22web.org/83687866554.pdfIn PDF document text
    • http://wevibakudibu.iblogger.org/rutomo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/genukopapovixo/esports_logo_template_no_text.pdfIn PDF document text
    • http://wufuxoponuwuros.epizy.com/crystallization_of_copper_sulphate_lab_report.pdfIn PDF document text
    • http://mixivilewajule.epizy.com/lonulotofipuzateginesajo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdad6b09-02e8-4ec3-870c-93be54c917c7/xetowutaxemisuwez.pdfIn PDF document text
    • http://kobepok.epizy.com/multiplication_table_worksheet_1-_12_blank.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/true_caller_id_app_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lumixi/healthy_fruit_and_vegetable_smoothie_recipes_for_weight_loss.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a5cc60a-56b7-4d38-80d5-2af6b3579a02/samsung_galaxy_tab_s4_user_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/fiddler_on_the_roof_original_broadway_cast_recording.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/latitude_longitude_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/69624948538.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/momopiwadogilitipumi.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA7 5852 bytes
SHA-256: eb04253823d2944aa1aa4b628b595d7af61fc2d0ac21cbc02739b69c4303b2af
font_01_sfnt_off0001209a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209A 2016 bytes
SHA-256: 761b17e7bf2b2d6862e9688b14ee5cfe6428344434fa3aace76d10d8d63a8780
font_02_sfnt_off000129f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F4 12168 bytes
SHA-256: 2ff508853b2213397df8fb927c6ff1b8599df6e8f6c8ee79bc27da57238d6b9c
font_03_sfnt_off000153d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153D5 16164 bytes
SHA-256: 3afbc95f4a2677bf4c8b77bd7df62e4dbeb651db4b5e482cf97b58e472170d58
font_04_sfnt_off000168ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168CE 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3