Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cdb6326e2410216…

MALICIOUS

PDF

68.6 KB Created: 2021-02-24 02:56:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 944e89b0505a69a6f7b2b6766970fdd0 SHA-1: 6e8a57c3c77e77bc0d392b97902f17d3d6ad0d6d SHA-256: 3cdb6326e2410216ac549c6628c8ce6cd5a31f065ad16cd6bd5ea3bd357ff5aa
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable hosting or link farms, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ClamAV detection 'Pdf.Phishing.Trojan' strongly indicate malicious intent. The primary external URI, 'https://seumenha.ru/strik?utm_term=maytag+3000+series+dryer+parts', is likely used to lure victims under the guise of a search result.

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/strik?utm_term=maytag+3000+series+dryer+parts PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4488349/normal_6019dcde5405d.pdfIn PDF document text
    • https://jasugigikimodo.weebly.com/uploads/1/3/1/3/131383258/ba3a1385bee7a.pdfIn PDF document text
    • http://lnstagramservicecopyrights.com/alistair_begg_booksetzvc.pdfIn PDF document text
    • https://javekulu.weebly.com/uploads/1/3/1/8/131872149/supomapesujifu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443814/normal_602b72b2ca626.pdfIn PDF document text
    • http://apparently-home.com/las_reformas_borbonicas_en_el_peru3nm4i.pdfIn PDF document text
    • https://buserakufazuwus.weebly.com/uploads/1/3/4/0/134097478/gepixepis_rifurukad_duxamexesidaf_ditogogoz.pdfIn PDF document text
    • http://teagreen.space/sesubowuxezuzesknr9r.pdfIn PDF document text
    • http://store50off.info/nuvutewesesozofojd2e61.pdfIn PDF document text
    • http://uorott.com/english_grammar_test_intermediateo8k42.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/jotogorurekuro/candy_cane_wreath_form.pdfIn PDF document text
    • https://s3.amazonaws.com/wovisak/total_war_warhammer_2_bretonnia_guide_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/53896263900.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_off0000cb23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB23 5508 bytes
SHA-256: b9a9b7c74a6be457496b2b6dc87aff4c1fa24bfd9827995c4a50ed400bb3a984
font_01_sfnt_off0000ddfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFE 12004 bytes
SHA-256: 45da12fe4ccad337a5805a8a33bdff403b7da8126057da0add4851453f43531d

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