Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ee2b3eb847c9972…

MALICIOUS

PDF

85.8 KB Created: 2021-02-06 16:47:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: f8026ab3f61548c4b08333e5b56488b1 SHA-1: 0197e5c3b9e2a168cdd4d6e37e271aea25a2ba00 SHA-256: 7ee2b3eb847c997211dc87f771c0e041eae38c638dfa1834ce071b67009d06a6
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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.
  • 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=portfolio+website+templates+codepen PDF link annotation
    • http://ecoservice-vlad.ru/31442138111typf5.pdfIn PDF document text
    • https://fapusogemewesil.weebly.com/uploads/1/3/2/3/132302858/lalosatebexemuv_galinosefubana.pdfIn PDF document text
    • https://vedirivokezijil.weebly.com/uploads/1/3/4/1/134108565/wawajosom.pdfIn PDF document text
    • https://lexugorubu.weebly.com/uploads/1/3/0/7/130776619/vesuk_karaxokifi.pdfIn PDF document text
    • https://womominajarizu.weebly.com/uploads/1/3/5/3/135392323/jotufa-rovunaxidi-negupaleb-vulaxozafokaw.pdfIn PDF document text
    • https://puwulafu.weebly.com/uploads/1/3/5/3/135329465/1593691.pdfIn PDF document text
    • http://mabay.fun/branches_of_chemistry_worksheeth2rhh.pdfIn PDF document text
    • http://bigowet.xyz/boom_island_park_in_minneapolis93dn3.pdfIn PDF document text
    • https://zemabata.weebly.com/uploads/1/3/4/6/134677216/4d94dfd1.pdfIn PDF document text
    • http://bcpzon4segurabetaviabcp.com/insert_data_into_hive_table_manually8sxct.pdfIn PDF document text
    • https://topuzuxet.weebly.com/uploads/1/3/0/7/130739133/2e3e03048c2c56.pdfIn PDF document text
    • http://wwbook.org/69010408842uibj0.pdfIn PDF document text
    • http://gratoramaa.space/the_imposters_handbook_free_download80ec9.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/wiremeresegikon/informant_app_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/pilaliderixudipupu.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_off00011387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11387 5532 bytes
SHA-256: 5fa2f8dc0a4f9771092138cd0b127b107cac33f9357fc12b556383e5aa9f044b
font_01_sfnt_off00012648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12648 10456 bytes
SHA-256: c65c8e7c68c0015a1a37f24f55006ce76b25c9fc68c11ea00d1e298c9feb40e1

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