Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7ffe404dd878153…

MALICIOUS

PDF

76.0 KB Created: 2020-12-15 22:13:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d57927e7aebe06a4c0990e9f69571199 SHA-1: d4ea2f26e6ac9f6b0dcaf16590ff80e94503b5d9 SHA-256: e7ffe404dd878153e0f6896c1f3db7e186f78553c9e76f23229f863ca6d73592
244 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to a known malicious redirector. The heuristic firings indicate this PDF is part of a link farm designed to direct users to potentially harmful content. While no scripts were explicitly extracted, the nature of the embedded links and the ClamAV detection suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gettraff.ru/123?utm_term=evolution+and+selection+pogil+packet+answers In PDF document text
    • https://gajorimimexawi.weebly.com/uploads/1/3/4/4/134458849/2444774.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376856/normal_5fcbe5e4f33bb.pdfIn PDF document text
    • https://bivapere.weebly.com/uploads/1/3/4/6/134689139/5b0b92.pdfIn PDF document text
    • https://wepugimi.weebly.com/uploads/1/3/1/0/131070973/9d013.pdfIn PDF document text
    • https://jufaxexave.weebly.com/uploads/1/3/0/7/130775513/nitogewekarab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372100/normal_5f91f2f3da403.pdfIn PDF document text
    • https://zalopajozi.weebly.com/uploads/1/3/1/4/131453352/fejesugotu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0dfe77d0c8f249d40ab54/t/5fc150421972c46e3ccf7341/1606504516073/zegur.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/java_for_android_development.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/pdf_business_intelligence_analytics_and_data_science_a_managerial_perspective.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc14d4c5bcb0228a2853727/t/5fc7b19fbfb90028be5aace7/1606922655856/62744430521.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_off0000ea81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA81 5412 bytes
SHA-256: fea0fde43e0e0d31cca2b3d06c550f25ea38735d665bf3c27aa50cd33bbd4e45
font_01_sfnt_off0000fd18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD18 11120 bytes
SHA-256: 1f6c4b504ffd272773a72ee74e90e407df230122093f74842b23b8760921dfe9

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