Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8843a1385f25567…

MALICIOUS

PDF

75.3 KB Created: 2021-06-04 07:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6f3cd1df6bdfb5aec0972908632b9a0 SHA-1: 73e6e9850aa889225a16c289687b9772fb335f53 SHA-256: d8843a1385f2556723b6d088e1a994436964718daeac29a706abc8ddfc31162f
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs, many pointing to disposable hosting and link farms, strongly suggests a phishing or malware distribution attempt. The ML classifier also indicated a high probability of maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://pistant.ru/pbw?utm_term=is+the+end+bar+still+open
    • https://cdn-cms.f-static.net/uploads/4406776/normal_601c63a2cda87.pdf
    • https://biziremidawa.weebly.com/uploads/1/3/5/3/135397591/b19b56ed8e7.pdf
    • https://static.s123-cdn-static.com/uploads/4403936/normal_5fcdf393c251d.pdf
    • https://fezagexagowib.weebly.com/uploads/1/3/5/3/135313062/gonabu-dujefit-makopawile-texag.pdf
    • https://cdn-cms.f-static.net/uploads/4460457/normal_60532448e6c05.pdf
    • https://static.s123-cdn-static.com/uploads/4475389/normal_5fc682b248886.pdf
    • https://gowumobajakexe.weebly.com/uploads/1/3/4/5/134585768/jijalofebuz_xurarikanozuj.pdf
    • https://cdn-cms.f-static.net/uploads/4378165/normal_601369f844e43.pdf
    • https://cdn-cms.f-static.net/uploads/4371247/normal_602a1e9bd0421.pdf
    • https://cdn-cms.f-static.net/uploads/4369926/normal_60222c6e5f859.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xojifot.pbworks.com/f/mufegotoniziwexukajugub.pdf
    • http://pagorevet.pbworks.com/w/file/fetch/144472578/80833751250.pdf
    • http://vafakana.pbworks.com/f/libro_de_biologia_ii_bachillerato.pdf
    • https://uploads.strikinglycdn.com/files/3659f1d8-8821-4a11-9464-519f20c14f4f/16555154416.pdf
    • http://taxexuwej.pbworks.com/w/file/fetch/144585705/monewezo.pdf
    • http://bawamotijeku.pbworks.com/f/nafudanomoda.pdf
    • https://uploads.strikinglycdn.com/files/d2188a27-d3bd-472e-9488-ea6be2bff00b/how_much_does_la_fitness_cost.pdf
    • http://fodorafirig.pbworks.com/w/file/fetch/144475782/64356699673.pdf
    • http://negipidini.pbworks.com/w/file/fetch/144553293/early_termination_of_lease_agreement_example.pdf
    • https://uploads.strikinglycdn.com/files/bd021cbb-ba01-4ab4-82b3-9ebbe5b49846/introductory_statistics_weiss_10th_edition_solution_manual.pdf
    • http://xujefix.pbworks.com/w/file/fetch/144417213/mowovufubepepar.pdf
    • http://nusuwoxub.pbworks.com/w/file/fetch/144426978/97737793848.pdf
    • http://kinuwibe.pbworks.com/w/file/fetch/144470781/pegitobikovugodurex.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea5a.bin
03736778d170c7a37b83ba7595e7cfad82274965680bb3da2ca177fc7e2d0466		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5A 5124 bytes
font_01_sfnt_off0000fbb2.bin
028158313833a3f8a96d65f93121898c66a1b73ee1dcfa057f704b33f1f181c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB2 10592 bytes

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