Malicious PDF — malware analysis report

Static analysis result for SHA-256 4712fd4e37f420f5…

MALICIOUS

PDF

81.3 KB Created: 2021-04-07 10:08:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 6b224ba8e35a20efd18ac21cdbd8d885 SHA-1: d65e1ec12ded0eeaa313b43213a4bf271f1184de SHA-256: 4712fd4e37f420f5e2094b021a8b7c6723ed0d475052feca3d572e2cfa1b27f2
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO spam or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content, likely a phishing page or a download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gimoguvi.ru/strik?utm_term=why+does+my+refrigerator+make+popping+noises PDF link annotation
    • https://cdn.sqhk.co/fasaparoba/jaigNwC/bufajevofebi.pdfIn PDF document text
    • http://jukavoluv.iblogger.org/fenufe.pdfIn PDF document text
    • http://dulexip.22web.org/94375270332.pdfIn PDF document text
    • http://nejomuwixeve.iblogger.org/xfinity_x1_modem_blinking_orange.pdfIn PDF document text
    • https://balevowoperat.weebly.com/uploads/1/3/1/3/131397989/861128.pdfIn PDF document text
    • https://cdn.sqhk.co/tibapopedeka/hfoXvif/vip_healthy_hazleton_pa.pdfIn PDF document text
    • https://jividakole.weebly.com/uploads/1/3/6/0/136090299/ronatojiwevomipix.pdfIn PDF document text
    • https://cdn.sqhk.co/vabalogu/wsje2gi/95017002000.pdfIn PDF document text
    • https://cdn.sqhk.co/farafakilof/fgi278V/23580346008.pdfIn PDF document text
    • https://cdn.sqhk.co/bulixanejad/6egjjX9/gabexo.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/zuniverijesud/2785248844.pdfIn PDF document text
    • https://s3.amazonaws.com/paxunu/fuhrerreich_imperial_federation_guide.pdfIn PDF document text
    • http://xojapenekoxij.rf.gd/beauty_salon_business_plan_doc.pdfIn PDF document text
    • http://wagimaparojova.epizy.com/xewanuviwipupopuralibape.pdfIn PDF document text
    • http://runapapaxezupow.rf.gd/dotuzupiwopozoxazuvatuf.pdfIn PDF document text
    • http://vepiwebime.epizy.com/ashampoo_photo_commander_16_handbuch.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/first_grade_sight_words_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/48255244023.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/ethyl_alcohol_has_higher_boiling_point_than_dimethyl_ether.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/search_by_image_android_from_gallery.pdfIn PDF document text
    • https://s3.amazonaws.com/rowubunak/fepurebudijiziji.pdfIn PDF document text
    • http://derijumofode.rf.gd/74134514529.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_off00010018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10018 5600 bytes
SHA-256: 580e17a6f6ad00e9604fb27b887e8142336e38618812f02770ede216c50f9f99
font_01_sfnt_off00011313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11313 10672 bytes
SHA-256: 193b354cdf65aded2d2b94ab0722bb255fc1530c0dae4064f995b206da9edb2f

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