Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2dbb4492427453b…

MALICIOUS

PDF

91.5 KB Created: 2021-05-01 02:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 5c029253d46f5aac866615a3503de6e1 SHA-1: bae1539711e5a38d84b8fb77cc9978a999862ba9 SHA-256: d2dbb4492427453b613daf540fe107d18bb62f4c6a6d083bccdd0c7942aa0dce
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution through these linked PDFs. No scripts were extracted, and the document body is heavily obfuscated, preventing a more detailed analysis of the specific payload.

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://soxebez.ru/strik?utm_term=the+production+of+space+chapter+1+summary PDF link annotation
    • https://pefasuvut.weebly.com/uploads/1/3/4/7/134716349/3343312.pdfIn PDF document text
    • https://besuxape.weebly.com/uploads/1/3/4/3/134374749/mejupulasexaru.pdfIn PDF document text
    • http://esmoney.site/ralikoga2wojl.pdfIn PDF document text
    • https://majotowuwirup.weebly.com/uploads/1/3/5/3/135346036/4493.pdfIn PDF document text
    • https://funotagikaxu.weebly.com/uploads/1/3/1/8/131857914/getaxuxejem_tizopexu.pdfIn PDF document text
    • https://katopogovalasa.weebly.com/uploads/1/3/5/4/135401177/digokub-mukanudaz-bomexug-losumolisezasa.pdfIn PDF document text
    • https://wunobenera.weebly.com/uploads/1/3/4/8/134887230/7a456f.pdfIn PDF document text
    • http://clobuss.ru/areas_figuras_compuestasepygu.pdfIn PDF document text
    • https://wokawopirajer.weebly.com/uploads/1/3/3/9/133999547/4875222.pdfIn PDF document text
    • https://rabiwibunefa.weebly.com/uploads/1/3/4/7/134747284/1240133.pdfIn PDF document text
    • https://pakefipeve.weebly.com/uploads/1/3/4/0/134017053/pixopo.pdfIn PDF document text
    • https://vuzavadakugodo.weebly.com/uploads/1/3/4/8/134857872/wegizopu.pdfIn PDF document text
    • https://cdn.sqhk.co/xagaxubibiz/oA8jagf/call_of_duty_ghosts_ghosts.pdfIn PDF document text
    • https://safasisi.weebly.com/uploads/1/3/4/4/134472516/3aa1b79.pdfIn PDF document text
    • http://hookup668.site/noxisovewakajisuson5zs3l.pdfIn PDF document text
    • https://cdn.sqhk.co/resozasevej/fjhjcnS/escape_the_room_games_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/monazaxumol/ejdgo4r/fezapovo.pdfIn PDF document text
    • https://gaxatibixowoki.weebly.com/uploads/1/3/1/4/131452935/fuwejidotuwux.pdfIn PDF document text
    • https://mixozanuzobese.weebly.com/uploads/1/3/5/4/135400893/1674080.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000129f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F0 5464 bytes
SHA-256: b67fffa0e993cbd42af936710e7e872ec2079527007a0ebd3471f14be3fea794
font_01_sfnt_off00013c6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C6E 10860 bytes
SHA-256: 868b4297fb8131180f5b21722f3bf46bc602ea7183125ce34b1457bf4dd1c4bf

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