Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb62eacadd0d48cf…

MALICIOUS

PDF

75.5 KB Created: 2022-06-01 03:43:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2022-07-15
MD5: 22293d3243be338a6626875d174804a0 SHA-1: 104c5df899d17107f2ffad53ed9e11cc0268c64b SHA-256: bb62eacadd0d48cf7016bf3eb77338e72a0d466088f8325b6ad37f8d9e8d63b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains a large number of external links, many pointing to potentially malicious domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary malicious URL identified is https://wirut.co.za/YmrXLWy8?keyword=here%20comes%20the%20sun%20sheet%20music%20choir%20sheet%20music%20printable%20version%201.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://wirut.co.za/YmrXLWy8?keyword=here%20comes%20the%20sun%20sheet%20music%20choir%20sheet%20music%20printable%20version%201
    • https://xekifukikake.weebly.com/uploads/1/3/7/5/137501369/0271024.pdf
    • http://laxycoffee.com/upload/files/jawenamabiforugakezewe.pdf
    • https://feltshoe.com/userfiles/file/xumobofapijezudefan.pdf
    • https://gomabimasukefop.weebly.com/uploads/1/3/4/4/134491899/bce7b9ce75fb011.pdf
    • https://mugifafuvutasij.weebly.com/uploads/1/3/4/1/134108805/1793695.pdf
    • https://banatili.weebly.com/uploads/1/3/5/3/135314160/zejifemezakidex.pdf
    • https://perumudu.weebly.com/uploads/1/4/1/4/141426869/4220411.pdf
    • https://akupunkturas-kezeles.hu/userfiles/file/mebabomivexuvinozigis.pdf
    • https://pajagiwoneb.weebly.com/uploads/1/4/1/3/141382058/9013845.pdf
    • http://dainichiji.com/upload_ckr/files/59417859832.pdf
    • http://gestaocipa.com/public_html/Imagens/file/dorapijuzivekarem.pdf
    • https://simufovugitusi.weebly.com/uploads/1/4/1/4/141418254/korifoxus_tukowi.pdf
    • https://pumikawe.weebly.com/uploads/1/4/1/3/141345360/200f987e502.pdf
    • https://kasorewo.weebly.com/uploads/1/3/2/7/132740312/pofutivugiketik-dokogisifubuliv.pdf
    • https://revixapega.weebly.com/uploads/1/3/4/6/134619396/5523280.pdf
    • https://nonewogigej.weebly.com/uploads/1/3/2/6/132681399/wetafigam_sawuladuzimeli.pdf
    • https://spvi.cn/filespath/files/20220504092246.pdf
    • https://xukotonaxi.weebly.com/uploads/1/3/1/4/131453431/bivunuviko.pdf
    • https://tofexozulemun.weebly.com/uploads/1/3/0/9/130969243/c4bf0828.pdf
    • https://cubicsqsolutions.com/userfiles/file/21010452961.pdf
    • https://xuvulusubakaxo.weebly.com/uploads/1/4/1/4/141449222/273194.pdf
    • https://boziwukajolefix.weebly.com/uploads/1/3/2/7/132711983/1fccd3a940b78.pdf
    • https://i-triada.net/upload/files/22265148929.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c151.bin
6d35ef140922d965e94c4831b6ccf99e1a4645470b02f44f47b644465875d425
pdf-font-stream PDF embedded font (sfnt) at offset 0xC151 17308 bytes
font_01_sfnt_off0000eeb3.bin
9bc11c0f675abbc23998afe525196abb6d33cd2c3a7cbeef10c87acc3b12a6b8
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB3 10988 bytes
font_02_sfnt_off000107d7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x107D7 16792 bytes