Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8a3249d6cf148f1…

MALICIOUS

PDF

84.1 KB Created: 2021-02-17 19:21:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 52a0c8010758c61eae8efa4bc3b1efcc SHA-1: a203c9be47ab0170b3ee034a2b6f2bda57518a3d SHA-256: f8a3249d6cf148f14ad39474f6e4bc7bc9fb399fac38a506f66ef04cd1bc1561
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs pointing to a link farm hosted on disposable domains, suggesting a phishing or SEO manipulation scheme. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/wix?keyword=mealworm+behavior+virtual+lab+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414851/normal_60269f6510990.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367271/normal_5ff4c678dd114.pdfIn PDF document text
    • https://gizomedapirev.weebly.com/uploads/1/3/1/4/131454265/zarumozi-limedopijodekez-migejetuwa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415937/normal_6020faa05ef0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466367/normal_600a9f287b264.pdfIn PDF document text
    • https://tabogivazosepa.weebly.com/uploads/1/3/1/8/131871767/gujoza.pdfIn PDF document text
    • http://ideal-it.fun/casio_fx_83gt_plus_manualkd1ud.pdfIn PDF document text
    • https://miwujiloj.weebly.com/uploads/1/3/4/3/134333625/7637675.pdfIn PDF document text
    • http://babysampler.com/gapufunujezirunidojabobgyfz1.pdfIn PDF document text
    • https://lelobetiladafan.weebly.com/uploads/1/3/4/4/134497055/6bd9d4a714.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/bawalidamovidud/descargar_avg_antivirus_gratis_2018_para_android.pdfIn PDF document text
    • http://wijogural.epizy.com/how_to_backup_android_contacts_to_gmail.pdfIn PDF document text
    • http://tisenunab.rf.gd/lijamogufisuve.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_off000100a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A8 5104 bytes
SHA-256: 944087f331d05e5b1e6f3be155c1893d64f1f00d05e9b38b5a8c6a791d803852
font_01_sfnt_off000111f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F2 10316 bytes
SHA-256: c1d0d2b5ad38b573a245947e8a46741fcee53d4f2160ef693a529e0389fd9d2b
font_02_sfnt_off00013549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13549 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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