Malicious PDF — malware analysis report

Static analysis result for SHA-256 500806478f03adfd…

MALICIOUS

PDF

87.2 KB Created: 2021-04-29 19:05:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 732eda134078cd8181fd1094d1a214e1 SHA-1: efc4157f98a4d05b61142b3bfb047f52d5c49990 SHA-256: 500806478f03adfd1979f5470e613b31e3b1726e02c37e2fa92d40966bac4fa4
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link farm designed to mimic search results, directing users to a suspicious URL. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded URLs suggest a phishing lure.

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://xajibur.ru/strik?utm_term=are+disposable+vapes+banned+in+massachusetts PDF link annotation
    • http://ridovise.sportsontheweb.net/napabizojaralanu.pdfIn PDF document text
    • http://modozadubop.mywebcommunity.org/nifosokanem.pdfIn PDF document text
    • http://bitalotava.scienceontheweb.net/31944350503.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d0aee4dd-c5bf-4c29-adcf-3aa844f59ef3.filesusr.com/ugd/193d13_43e6ab1318734577b7850035b6b64b05.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a0e49a0-dc7d-46a7-a06c-c298d01d53cb/wufivafixuvanitasasokox.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/twitter_picture_er_chrome.pdfIn PDF document text
    • https://f405dec1-7f90-4f4c-a861-5286f67d0127.filesusr.com/ugd/ab922d_61990522aa2c4fc9837c787725c16fcb.pdf?index=trueIn PDF document text
    • https://abbf68a8-5b21-4996-91be-11266bd273ed.filesusr.com/ugd/9374a7_abb431f75f02413cb45fcc499d898285.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/vuxewitazej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f02ad876-0312-4ccc-91f3-38889e751db6/ada_o_el_ardor_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a311a168-f09b-4d4e-b60f-4ae09594e7a0/lamudupigi.pdfIn PDF document text
    • https://63a0a607-6d1b-4b95-a813-f1b07cabc719.filesusr.com/ugd/ad56f2_8392455694f6407d903a3f3df5eb283d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/nursing_scope_and_standards_of_practice_third_edition_2015_apa_citation.pdfIn PDF document text
    • https://4123e755-5e7e-4fb8-b167-49ba90d37259.filesusr.com/ugd/fd3290_737cbfc13ae24552850838bf29c4082c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mujevubutukoxu/didikolumajazebugesisase.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/minecraft_pe_beach_house_map.pdfIn PDF document text
    • http://guriseb.myartsonline.com/aws_developer_certification_dumps_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85152a38-e844-4847-bcf3-ecdb6729c9a4/56590942782.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d862f56f-f3ad-426c-a9a5-dbacb1c87e89/87913542539.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/old_school_bagel_cafe_tulsa_ok.pdfIn PDF document text
    • https://s3.amazonaws.com/jepavilutabilel/mugiduze.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_off00011872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11872 5500 bytes
SHA-256: 72ef2a782b7770f8ef4b731d2dc06a598c687078b3380f8aa91520f92ebebadf
font_01_sfnt_off00012b04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B04 10688 bytes
SHA-256: dbba0a768f61ec5a7006f8706bf645ddfb07619458fc3fd0fb0fe3c2773bfce4

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