Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a8ac3e9f63e2fff…

MALICIOUS

PDF

78.6 KB Created: 2021-02-25 18:36:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 669a6f4262760ea0f4c4090317d04f4a SHA-1: da5603004cf070689685984f4d19c4eea7e27e93 SHA-256: 5a8ac3e9f63e2fff0d5115b2c3fb8eb01f3179b906d97e45f6702c625528c38e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it is part of a link farm designed to manipulate search engine results or direct users to potentially malicious content. The presence of multiple disposable domains and Weebly subdomains further supports this assessment.

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
  • 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.
  • 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://seumenha.ru/award?keyword=how+to+read+red+queen PDF link annotation
    • http://lnstagramcopyrightservices.org/inverse_of_2x2_covariance_matrixryq8q.pdfIn PDF document text
    • http://vashe-zdorovie.xyz/lesson_plan_kindergarten_template8yidz.pdfIn PDF document text
    • https://cdn.sqhk.co/saxuxaka/idjeaMS/dugagezoweke.pdfIn PDF document text
    • https://nukivobiwej.weebly.com/uploads/1/3/4/0/134016752/lovibodujo.pdfIn PDF document text
    • https://welafunugor.weebly.com/uploads/1/3/5/3/135327357/5181682.pdfIn PDF document text
    • https://cdn.sqhk.co/woteruzid/Zoxib4a/38562217757.pdfIn PDF document text
    • https://masenajeronuzes.weebly.com/uploads/1/3/1/6/131637464/degarotamiluj-sinekubijixe-kavumetovipij-wojoguw.pdfIn PDF document text
    • https://nobaloledajasom.weebly.com/uploads/1/3/2/6/132681012/sogakaze-tolupunepapob-lupurulozowal-luzeni.pdfIn PDF document text
    • https://tabupuja.weebly.com/uploads/1/3/4/6/134647436/lewobuxe_zotigof_gowona.pdfIn PDF document text
    • https://fazokovonopa.weebly.com/uploads/1/3/5/3/135329702/5ea24fd.pdfIn PDF document text
    • https://kujugozu.weebly.com/uploads/1/3/4/6/134660126/3dfab.pdfIn PDF document text
    • https://betedodokadez.weebly.com/uploads/1/3/4/8/134882186/e6b7f4b.pdfIn PDF document text
    • https://nubeboganiroj.weebly.com/uploads/1/3/1/3/131384383/pamum-jupag-gaxulofaxupe-kolukuse.pdfIn PDF document text
    • https://nizevamil.weebly.com/uploads/1/3/2/8/132814567/6946285.pdfIn PDF document text
    • http://shoppermarket.online/reading_strategies_for_high_school_students3wg6e.pdfIn PDF document text
    • https://sizokagijabid.weebly.com/uploads/1/3/4/6/134652394/moxurezojazawe.pdfIn PDF document text
    • https://nunibuzobaga.weebly.com/uploads/1/3/0/7/130740367/zakobetofitewibo.pdfIn PDF document text
    • http://jilet1.club/36908221399v8ng6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/lawakux/varafu.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/18782339518.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3E 4620 bytes
SHA-256: d40e50fe2d4169af4ec8c4f73ea654217f013b3c04c0a3a140f3186fadad136c
font_01_sfnt_off0000fbfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFB 10380 bytes
SHA-256: cd2fd13f2563e2baa0960bf8e520b39107100c933350af2d7ea89b5b2c897019
font_02_sfnt_off00011f60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F60 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176