Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a3fb65948644c0d…

MALICIOUS

PDF

71.9 KB Created: 2021-01-03 12:21:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 72ea4eeaad2a7fc27b86b5d62128edf4 SHA-1: d41a7ae81ff41dd507c8c61841996efab3464b27 SHA-256: 9a3fb65948644c0dd7d5a1a5bdcf18975a5a7b3986acb7e8d6d4246dc87dc0ee
222 Risk Score

Malware Insights

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

This PDF file contains numerous links to external resources, indicating it is part of a link farm designed to redirect users to malicious sites. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL pointing to known malicious infrastructure. The 'SE_INVOICE_LURE' heuristic suggests the document's content is intended to trick users into clicking these links by impersonating an invoice or payment request. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://cctraff.ru/aws?utm_term=after+such+knowledge+what+forgiveness+pdf
    • https://cdn-cms.f-static.net/uploads/4384825/normal_5fa95b711dd20.pdf
    • https://wurilulisewanid.weebly.com/uploads/1/3/4/7/134728532/9707409.pdf
    • https://static.s123-cdn-static.com/uploads/4370541/normal_5fc6ac2c414e6.pdf
    • https://dagatofolake.weebly.com/uploads/1/3/0/8/130874029/969f2f.pdf
    • https://cdn-cms.f-static.net/uploads/4366327/normal_5f870e34e1265.pdf
    • https://cdn-cms.f-static.net/uploads/4365576/normal_5faf80e0b20a3.pdf
    • https://dumetokewip.weebly.com/uploads/1/3/4/3/134394823/1986650.pdf
    • https://static.s123-cdn-static.com/uploads/4477863/normal_5febac3772c13.pdf
    • https://nitiruminaxodax.weebly.com/uploads/1/3/0/7/130738633/pewosixirobak-xoseb-ruxofofekomi-gufakizibunaneg.pdf
    • https://cdn-cms.f-static.net/uploads/4388174/normal_5fd9787dcf2a6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/559e3213-d606-459e-9a28-ac7807408639/vujafaru.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcc8.bin
a59d6699cacffe6c10802a1c663a78e5848fec2c0bfcf7078e2b888893713a3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC8 5620 bytes
font_01_sfnt_off0000f008.bin
9d5eb258ae411f205d1446791d307212f298433b7c2c08b947bdfbcba4dcd489		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF008 10196 bytes

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