Malicious PDF — malware analysis report

Static analysis result for SHA-256 490a4070409d7966…

MALICIOUS

PDF

80.3 KB Created: 2021-02-03 09:41:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 9ed64062a5fd9abf5951f756f81d2e6e SHA-1: 42250cccefbe64bdcdc18774a05fa1589972028b SHA-256: 490a4070409d7966fa464916eed5dc04e5929f5e1a14acf3d497d4da78f3b526
244 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 8

  • 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.
  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://leonvi.ru/aws?utm_term=b.+ed+exam+form+fees PDF link annotation
    • https://warevinigipa.weebly.com/uploads/1/3/4/8/134898994/8e20c1e04.pdfIn PDF document text
    • https://rijixovo.weebly.com/uploads/1/3/5/3/135339233/jabatomarezusap.pdfIn PDF document text
    • https://rivabugejovo.weebly.com/uploads/1/3/0/7/130739095/nafidoxadevuzunimot.pdfIn PDF document text
    • https://winugemu.weebly.com/uploads/1/3/1/0/131070294/mowel-jeludedaburem-fukun.pdfIn PDF document text
    • https://gexuguxibam.weebly.com/uploads/1/3/2/6/132696321/weviduvidegorak.pdfIn PDF document text
    • https://taxezuwijukiwum.weebly.com/uploads/1/3/1/6/131606901/75f6244d3f.pdfIn PDF document text
    • https://vafukomoruf.weebly.com/uploads/1/3/4/8/134862603/5236191.pdfIn PDF document text
    • https://cdn.sqhk.co/vasegodesazu/ehchbMF/jesurikom.pdfIn PDF document text
    • https://cdn.sqhk.co/worupageke/ihvYZO0/labrador_retriever_puppy_wallpaper.pdfIn PDF document text
    • https://nolipugi.weebly.com/uploads/1/3/4/6/134652161/guvonetudifigukujag.pdfIn PDF document text
    • https://vipizavubo.weebly.com/uploads/1/3/1/4/131407691/b45beddb15161f2.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/rebomedug/53819356313.pdfIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/electronically_controlled_manual_transmission_cars.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/congestive_cardiac_failure_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/accomplishment_report_for_teachers_introduction.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_off0000fc2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2E 5172 bytes
SHA-256: 8004e3b57d3a2a18020175130f1a45ad38d5969f857229e6a46b9c0baa6ddd2b
font_01_sfnt_off00010dbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBC 11224 bytes
SHA-256: 6f860ffff6d12f0e17998ff452378a737146df0f29325061528d4c8fcffbe7e5

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