Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c2b5df2ef771b3b…

MALICIOUS

PDF

62.1 KB Created: 2021-02-13 01:45:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f95ed5668578168b766b88e127c7add8 SHA-1: df46a5fa6f441abf89b724ead15ab754e8f101fb SHA-256: 5c2b5df2ef771b3b4a7d0304878ac47f861bf00dbbe2b23cb80adae86b309adf
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=holt+geometry+lesson+3+1+lines+and+angles+practice+a PDF link annotation
    • http://migerov.xyz/542586942417q805.pdfIn PDF document text
    • http://duxolaw.22web.org/org._apache._spark._sql._dataframe_jar.pdfIn PDF document text
    • http://vykupavto54.ru/38440706596rzrv3.pdfIn PDF document text
    • https://cdn.sqhk.co/sebutarukaw/ejgQjjM/zemuxufezosiginobeli.pdfIn PDF document text
    • https://cdn.sqhk.co/dewobube/kjaibhh/43324912530.pdfIn PDF document text
    • https://cdn.sqhk.co/liregevo/woOifdH/satyr_play_literary_definition.pdfIn PDF document text
    • https://cdn.sqhk.co/sojowidaz/fjhghFN/fejadukagidudogasisakuw.pdfIn PDF document text
    • http://laulu-go.ru/74829167315mb223.pdfIn PDF document text
    • http://steblin.pro/poxegodinawjqx84.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/jadudusujuje/behaviour_chart_template_ks1.pdfIn PDF document text
    • http://lifukobokana.rf.gd/chin_tranh_v_ha_bnh.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_off0000b4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4CB 5672 bytes
SHA-256: ae873c0d2f299bf0fc6a7d88ead948e1d4acf337c8050df3bf455063d284f202
font_01_sfnt_off0000c817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC817 10552 bytes
SHA-256: c521cb00abcbb457159b63c765203b588e198493af37300af7ca0ea0e6c57cd2

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