Malicious PDF — malware analysis report

Static analysis result for SHA-256 7844eb09b175026c…

MALICIOUS

PDF

70.3 KB Created: 2020-12-22 07:56:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: aab827df07be9b06cec7e09b7701386b SHA-1: 70c6f9790ff5394fd30b9a5bfe75b3bcb8703731 SHA-256: 7844eb09b175026c9d0be37ab43944b75d27ed9c7e7e4eeca672b8cc89a351a1
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, including detections for malicious redirector links and a link farm on disposable hosting. The embedded URLs, such as 'https://traffine.ru/123?utm_term=red+velvet+bundt+cake+calories', and numerous links to Weebly and other disposable hosting services, indicate a campaign to distribute malicious content or engage in phishing. No scripts were extracted, but the PDF structure itself is used to host and present these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffine.ru/123?utm_term=red+velvet+bundt+cake+calories In PDF document text
    • https://judenebubiz.weebly.com/uploads/1/3/4/6/134656374/c6dde7.pdfIn PDF document text
    • https://fupebabo.weebly.com/uploads/1/3/4/6/134601971/purefugatu.pdfIn PDF document text
    • https://budamasut.weebly.com/uploads/1/3/4/9/134903336/zisibaj-gakuxu-naxaniwidepe-wiwikadexafibu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374839/normal_5f946c8ca32e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417531/normal_5f9de9b8e0f25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447630/normal_5fbe07ed1b666.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366987/normal_5f90382b83cf7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465269/normal_5fbf0992e6e6a.pdfIn PDF document text
    • https://taxudomajifi.weebly.com/uploads/1/3/4/1/134108655/movodasoluxuvowi.pdfIn PDF document text
    • https://setisobizosepi.weebly.com/uploads/1/3/4/6/134670504/6832869.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367271/normal_5f8cec67785ce.pdfIn PDF document text
    • https://dajetulanew.weebly.com/uploads/1/3/4/3/134309067/vulepemi.pdfIn PDF document text
    • https://keminugugenoxag.weebly.com/uploads/1/3/4/3/134321568/4563933.pdfIn PDF document text
    • https://ramakizuwag.weebly.com/uploads/1/3/4/3/134321509/maboz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369763/normal_5fad44194b958.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD676 5204 bytes
SHA-256: d04f8342b8e1e3f37296bb5d78e22afe28131b38a9355ce4855f48c4c3770cdb
font_01_sfnt_off0000e83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83F 10712 bytes
SHA-256: 3b62d17e42e8318c7659eef05a75e6b2da6a9f3d0faf58d12ebc4cbb06995234

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