Malicious PDF — malware analysis report

Static analysis result for SHA-256 5608cadcb625637d…

MALICIOUS

PDF

76.8 KB Created: 2021-03-23 16:42:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 94c4772b8640b3ff9587620bc1a474b9 SHA-1: fb0c0f4668aac031b9f34896fd4c78b239ec6192 SHA-256: 5608cadcb625637d71571c133e467aa79f78fae25a26d471e06baee93a0513e4
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a tactic of redirecting users to potentially malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://fokemale.ru/strik?utm_term=brunner+%2526+suddarth%2527s+textbook+of+medical-surgical+nursing+online PDF link annotation
    • http://ruzalonuxow.22web.org/vavavesakomuzopot.pdfIn PDF document text
    • http://wuxizovawolimo.22web.org/chefman_air_fryer_3._5_liter_manual.pdfIn PDF document text
    • https://mixizuvas.weebly.com/uploads/1/3/5/3/135383824/9059061.pdfIn PDF document text
    • https://mevinabepoke.weebly.com/uploads/1/3/2/7/132740553/afea3e31601e1c0.pdfIn PDF document text
    • https://wikuxokogex.weebly.com/uploads/1/3/1/8/131872144/6f0a253aac5d.pdfIn PDF document text
    • https://migigazafakag.weebly.com/uploads/1/3/4/3/134377970/9d6ef173.pdfIn PDF document text
    • https://vepezoroz.weebly.com/uploads/1/3/4/6/134605761/f4f919eb6c6.pdfIn PDF document text
    • https://tebifuwufarul.weebly.com/uploads/1/3/4/8/134886387/jukizafofobigufaxo.pdfIn PDF document text
    • https://gekonoxare.weebly.com/uploads/1/3/4/4/134480638/2514620.pdfIn PDF document text
    • https://lisudite.weebly.com/uploads/1/3/2/6/132682892/6072190.pdfIn PDF document text
    • https://wozijasobinela.weebly.com/uploads/1/3/4/4/134445001/5326370.pdfIn PDF document text
    • https://fosaxobe.weebly.com/uploads/1/3/4/8/134882536/pifogota-sozot-tifuduzi.pdfIn PDF document text
    • https://zokemubolito.weebly.com/uploads/1/3/4/8/134895641/nupekagamivijip_wibitew_noposo_tuluwewaloramu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pazoluno.epizy.com/biomagnetismo_mascotas.pdfIn PDF document text
    • https://s3.amazonaws.com/novipaliwid/game_bomb_squad_mod_money.pdfIn PDF document text
    • https://4ad55601-b8ab-4ae0-bc0e-e90069072326.filesusr.com/ugd/3aca14_8e7f849f7df34393bb63d51d3390a064.pdf?index=trueIn PDF document text
    • https://e5baaea7-7007-41de-9367-4ebf3ed55875.filesusr.com/ugd/8e1900_1473a2dea1ec45238873b4cd476bdd0c.pdf?index=trueIn PDF document text
    • https://ab25a8b3-4d80-4d4b-93a1-c1347014fa7c.filesusr.com/ugd/8d0191_f4dd2b6dcaa747f6aed31c3c11690426.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xarojapi/gebofe.pdfIn PDF document text
    • http://notufexunu.rf.gd/how_do_i_make_my_spectrum_remote_light_up.pdfIn PDF document text
    • https://6bb2b61b-82bf-473b-8365-63ddb02ddbdd.filesusr.com/ugd/d55797_3a1e2011e78041599540efd5ead3540e.pdf?index=trueIn PDF document text
    • https://26f2e344-8444-46ea-90c9-5a893bcc2fb3.filesusr.com/ugd/b8c837_31c9398186944d53b9a031f3f53a09a3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/tekonsha_primus_iq_trailer_brake_controller_troubleshooting.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/xusokasigosuvodadul.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/autocad_2017_file_size.pdfIn PDF document text
    • http://pujusojup.epizy.com/capoeira_moves.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_off0000ed6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6C 4304 bytes
SHA-256: 375c639ac660eac4cf97e92d50f16bcc39d9f1ba24484bd106ea14aa7da0cfd1
font_01_sfnt_off0000fc0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0F 12736 bytes
SHA-256: 5f683ec361444d82be1eedef8ed0aed41765b6cdd1da0911dcdb23395050d806

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