Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f9371d1d5ca89dc…

MALICIOUS

PDF

71.5 KB Created: 2021-02-21 20:14:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ff4c3ddd2a910690820411a3aaf84871 SHA-1: e079311b0ed81838ff695e2fa35d1c4b956c430c SHA-256: 9f9371d1d5ca89dc38fd39911d6291897b6207d8dad5fcb5b6831d67e9910a3d
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/123?utm_term=dungeons+and+dragons+handbook+5th+edition+pdf PDF link annotation
    • http://vitrinachel.ru/garenejebasl4e4h.pdfIn PDF document text
    • https://sikezenubotimer.weebly.com/uploads/1/3/0/7/130739875/kigirule.pdfIn PDF document text
    • https://famemizi.weebly.com/uploads/1/3/6/0/136006686/lilidefidovapij-fezodowevava-fofolisos.pdfIn PDF document text
    • http://health-top.ru/dusexavuzobadanuzajivog30ng.pdfIn PDF document text
    • http://kinorio5.xyz/luzisafewowue4b23.pdfIn PDF document text
    • https://ponadolofulofuk.weebly.com/uploads/1/3/1/3/131398561/nofevak.pdfIn PDF document text
    • http://yarrebitteh.online/berlin_historical_inevitability20uy4.pdfIn PDF document text
    • http://consequences.space/what_is_the_tone_of_the_millers_talet9o0d.pdfIn PDF document text
    • http://dalovujunaguk.22web.org/vevinubulebitowaxezuju.pdfIn PDF document text
    • https://lisiruzefixa.weebly.com/uploads/1/3/4/4/134495270/4829060.pdfIn PDF document text
    • http://dle-tpl.site/business_plan_sample_docgxzq4.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/zafibimutadoti/44336749166.pdfIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/pamezudogajinize.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/update_cpanel_license_manually.pdfIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/bubble_shoot_apkpure.pdfIn PDF document text
    • https://s3.amazonaws.com/juvetaso/free_guided_meditation_app_ios.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/android_9_easter_egg_paint.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_off0000d8be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BE 5596 bytes
SHA-256: d1b43ff2d775a25ae060480f72821de154b91dc242bc9c6eb02cd3bb55ae4e3b
font_01_sfnt_off0000ebcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCB 10992 bytes
SHA-256: 4debf0d9e4465d3fc456597418fde8e62ae8e3e6034c33f521e071287f2bf2ba

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