Malicious PDF — malware analysis report

Static analysis result for SHA-256 78d074c3e76ca91a…

MALICIOUS

PDF

95.1 KB Created: 2021-06-01 13:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 91ef6768018b3cd8e17faeaa4bccdc84 SHA-1: 7d97fd9a42aafebda8e9c3efab068c827c802468 SHA-256: 78d074c3e76ca91ad4055f7d4b8f5a4e8eb13d74100a3966cb9ca2974e61790e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDF files, suggesting a link farm for SEO manipulation or to host malicious content. The primary URL, https://ketchas.ru/pbw, is likely a phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ketchas.ru/pbw?utm_term=fundamentals+of+geometric+dimensioning+and+tolerancing+pdf
    • https://ribijiwazafi.weebly.com/uploads/1/3/4/8/134881841/4380277.pdf
    • https://gulemexaw.weebly.com/uploads/1/3/4/3/134360266/1170116.pdf
    • https://mebirofaz.weebly.com/uploads/1/3/5/3/135384836/woloneminebifud.pdf
    • https://static.s123-cdn-static.com/uploads/4370541/normal_5ffa210fe23be.pdf
    • https://finuredapek.weebly.com/uploads/1/3/4/3/134352460/fd2a1bab1f72.pdf
    • https://kemosufasegu.weebly.com/uploads/1/3/4/3/134348140/xepimobane.pdf
    • https://zisugopijelides.weebly.com/uploads/1/3/1/4/131438068/kibewag.pdf
    • https://dasewukux.weebly.com/uploads/1/3/5/9/135956745/fiwikab.pdf
    • https://mijonogopo.weebly.com/uploads/1/3/5/3/135327524/vudevanonabafax.pdf
    • https://zizolewezefid.weebly.com/uploads/1/3/4/7/134702939/kabutidenowutasamor.pdf
    • https://dojarugakafep.weebly.com/uploads/1/3/4/4/134471698/d1df24.pdf
    • https://wazumiwu.weebly.com/uploads/1/3/6/0/136038811/tuvekebomirene.pdf
    • https://cdn-cms.f-static.net/uploads/4471099/normal_6018c2e789036.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5488c3e2-bb84-4e83-aae0-bbb02312392b/tablas_trigonomtricas_para_imprimir.pdf
    • http://supatibu.pbworks.com/f/nadebuzuletiloweroreno.pdf
    • https://uploads.strikinglycdn.com/files/e1063002-ab44-4da1-8d98-24c5f6b58eda/saxebibizakewunogigovuz.pdf
    • https://uploads.strikinglycdn.com/files/dae29e16-6b21-4630-8803-3af284c30495/xigezetesuxole.pdf
    • http://mapijakemifo.pbworks.com/f/96726693577.pdf
    • https://uploads.strikinglycdn.com/files/d02e4671-477c-4521-96cd-a1a4b1b30003/bibetibuxagerenewidubeke.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://scripts.sil.org/OFL
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f93.bin
8a599a54013d02d5bc9ad8ac70df8d6a7bac5307695e86e880a88943622f4fa6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F93 5432 bytes
font_01_sfnt_off000121bb.bin
a2c1cc6ff58d26b1194b5745a66227c36f468ebb3640feafc9f8aa9c549ddac0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121BB 6196 bytes
font_02_sfnt_off000130c8.bin
2e135273f6128431c7d0e11d4feedd13134931bd8d2db480cabc0fb7814d6e08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130C8 11328 bytes
font_03_sfnt_off00015706.bin
852e0d6ce07a1db2e11154f4548aec4dc29a2cf073112f8b6a2b4be1be4894b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15706 16172 bytes

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