Malicious PDF — malware analysis report

Static analysis result for SHA-256 a95833a95d0355f2…

MALICIOUS

PDF

79.6 KB Created: 2021-03-15 02:18:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 8b62252075b87363d47a38b3d69f2702 SHA-1: 233060de10af2ac6495cec23373058915eab1904 SHA-256: a95833a95d0355f24d79e4ae8d23e9c493df00cbea4e34a7e297ecc74751f10b
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics, including ClamAV and an ML classifier, indicating it is likely a phishing or trojan delivery mechanism. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to manipulate search engine results or redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of numerous external links is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/award?keyword=aluminum+6061+properties+pdf PDF link annotation
    • http://xiletunekukine.iblogger.org/59945244887.pdfIn PDF document text
    • https://jisofuzevilane.weebly.com/uploads/1/3/0/9/130969501/kidod-fasib-buvapisovowu.pdfIn PDF document text
    • http://simopuvoramawu.mywebcommunity.org/nusabasonezuwe.pdfIn PDF document text
    • https://rotarivinevi.weebly.com/uploads/1/3/4/5/134599250/tenatop.pdfIn PDF document text
    • http://mizizufiku.mywebcommunity.org/hp_7525_printer_driver.pdfIn PDF document text
    • https://buvonage.weebly.com/uploads/1/3/0/9/130969236/luluba-pezobebutofilev-nebijop-vofagatoguv.pdfIn PDF document text
    • http://nemekarasika.iblogger.org/gunebutemeti.pdfIn PDF document text
    • http://kogutojoveso.mywebcommunity.org/81724109788.pdfIn PDF document text
    • https://xulozajewe.weebly.com/uploads/1/3/1/3/131384688/6195667.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/resabomibogodaw/24442978557.pdfIn PDF document text
    • https://80b2a579-f9ed-4aa0-b91a-ac3c8973c086.filesusr.com/ugd/353d00_c5e787a99f214ec9bd5c070ca1d8ffff.pdf?index=trueIn PDF document text
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_c05a2032dd1a4d6ca609a7b2ee1003b4.pdf?index=trueIn PDF document text
    • http://kimizajoveso.epizy.com/96838219389.pdfIn PDF document text
    • http://nejesezape.myartsonline.com/78805565918.pdfIn PDF document text
    • https://538d8494-0c7d-401a-b890-0485f6bc7bca.filesusr.com/ugd/29c71c_908545bec60545748c2b651f207dda22.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sazixipame/fender_mustang_amp_gt40_footswitch.pdfIn PDF document text
    • https://5053e88e-9e18-4719-890c-32a1cca0295d.filesusr.com/ugd/411503_12740ebf8bd944f59c34b818e3b4d649.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/brc_internal_audit_form.pdfIn PDF document text
    • http://validexa.epizy.com/2008_ford_escape_wheel_size.pdfIn PDF document text
    • http://wewamamewiler.atwebpages.com/inteligencias_multiples_definicion_y_caracteristicas.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_off0000f580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF580 5316 bytes
SHA-256: dc4402e7a2ff01135f09b63e61008147fbf9c674a2ba0314ce223937eab6f078
font_01_sfnt_off00010787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10787 11800 bytes
SHA-256: b9949b0c185dd1584f9e3fcaed3a3d4b46e7652686895f27411243e5ec5b6e0b