Malicious PDF — malware analysis report

Static analysis result for SHA-256 6febdfaa40994dda…

MALICIOUS

PDF

78.8 KB Created: 2021-03-14 19:59:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 4dba3f3d58b62a2dbc810921f1fe1c73 SHA-1: 26d07cbf3210d72403defccadde4bd5cf96fb149 SHA-256: 6febdfaa40994ddaed825b4bc3c78477db0646c199a0352d500256821e69d37e
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable hosting and appear to be part of a link farm designed to redirect users. The presence of these URLs and the heuristic indicating a link farm strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/strik?utm_term=american+history+x+curb+stomp+did+he+die PDF link annotation
    • https://nagipunewemog.weebly.com/uploads/1/3/5/3/135315215/nojawavusa-masolopijubedij.pdfIn PDF document text
    • https://xibatelilon.weebly.com/uploads/1/3/1/6/131637149/zuxeduvoruvi-rarado-lasovaxu-nuwetovi.pdfIn PDF document text
    • http://banademebilite.sportsontheweb.net/teraziw.pdfIn PDF document text
    • http://kumajamefe.getenjoyment.net/38109430509.pdfIn PDF document text
    • https://mejojesakawevud.weebly.com/uploads/1/3/1/4/131438193/c97111aa3346a.pdfIn PDF document text
    • https://sijalafad.weebly.com/uploads/1/3/4/8/134887162/didumejeguja.pdfIn PDF document text
    • http://nusezuretoti.scienceontheweb.net/all_about_space_tour_of_the_universe.pdfIn PDF document text
    • https://zuwuroxiver.weebly.com/uploads/1/3/1/0/131070979/xevofakamased.pdfIn PDF document text
    • https://bikezurikol.weebly.com/uploads/1/3/4/6/134612173/2259090.pdfIn PDF document text
    • http://zefutuwukeras.getenjoyment.net/customs_law_manual_2020.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/kosipefojaw/9295287095.pdfIn PDF document text
    • https://56a7be67-7dca-40da-a973-69ad719fb73b.filesusr.com/ugd/fedf23_342040a8526d45b3934909934d2878d3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/dibujos_de_caras_feliz.pdfIn PDF document text
    • https://c9b0c9dc-51ad-46ec-84b2-dbc26df53712.filesusr.com/ugd/b6f588_6cb1ae4bef8c4117b2adfa076c2f855f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bevarolimesale/puzivuponifusosel.pdfIn PDF document text
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_699a5c977b814cc1a97b5a7e8262bfa1.pdf?index=trueIn PDF document text
    • http://maretubozewugi.myartsonline.com/baofeng_uv-5r_dual_band_radio.pdfIn PDF document text
    • http://vujuvisesakok.myartsonline.com/83431293835.pdfIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/dr_heideggers_experiment_symbolism.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/muzomogefarunisogatu.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_off0000f60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60B 5580 bytes
SHA-256: 1879a2307956be976f555cc1f4588d05f06461c2240180ab24d98e334a4b73da
font_01_sfnt_off000108d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D9 10996 bytes
SHA-256: b7cc091ae98a2d644b47ab4d6e75ab865898e32a32588060d118c980f0a0b871

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