Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb9fcff7e91020d3…

MALICIOUS

PDF

76.0 KB Created: 2021-03-19 17:10:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 89e97ec02e698db6ba4dc4cb2b19f229 SHA-1: 84b33155cd17ca730223a38bb0d3d4d0f05def4b SHA-256: cb9fcff7e91020d301c9f236637d63deb1cef978e839e62cebcc03a7807906d8
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://dafemum.ru/123?utm_term=barclays+corporate+social+responsibility+report+2017 PDF link annotation
    • https://cdn.sqhk.co/fujavuraleko/Rheiajb/63426856856.pdfIn PDF document text
    • https://cdn.sqhk.co/gulifunanale/cgeLzjg/black_art_wallpaper_app.pdfIn PDF document text
    • https://cdn.sqhk.co/kurotevu/cjdhhmK/why_learn_business_management.pdfIn PDF document text
    • http://zaketukurokisof.iblogger.org/el_alquimista_para_descargar.pdfIn PDF document text
    • https://cdn.sqhk.co/wazilisiko/jcihYif/pictoword_classic_answers_level_97.pdfIn PDF document text
    • https://cdn.sqhk.co/govizanorev/jahghbm/jikepatoxowupoka.pdfIn PDF document text
    • http://xavelodezazil.iblogger.org/solugogagexagavum.pdfIn PDF document text
    • https://cdn.sqhk.co/sedazozesufu/hiZPiiq/2976770750.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/gewisetug/50581093674.pdfIn PDF document text
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_7a9023120d84456d9c28a2c9fa77ff98.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zagubip/gewevama.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/kaco_inverter_datasheet.pdfIn PDF document text
    • http://tepopugo.rf.gd/ccie_routing_and_switching_v4._0_configuration_practice_labs.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/76706384530.pdfIn PDF document text
    • https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_e6274165f6324ab0ac2ab786502dc41c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vipinib/mc6_jumpmaster_study_guide.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_off0000e9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F3 5624 bytes
SHA-256: 3eb64e6ed4b9df232f3288d3285c2b101d71ccd50f240337ec4e272916822872
font_01_sfnt_off0000fd37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD37 10948 bytes
SHA-256: ef1012b58fdc89eff57c8d715c1becec9c19839920f4ff743a79543d98e01421

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