Malicious PDF — malware analysis report

Static analysis result for SHA-256 786b801f2503479c…

MALICIOUS

PDF

79.7 KB Created: 2021-05-28 20:52:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b712c788c1de9a11b740a6c2d0fa62cd SHA-1: 2f4caad8d5c2db75f456003e07e59465c3874db4 SHA-256: 786b801f2503479ca7d3c3f2f9005882855688d6f2702dc13cc377a2d6759891
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to PDF files hosted on Weebly subdomains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/strik?utm_term=ejercicios+de+funciones+del+lenguaje+pdf
    • https://juwabizaf.weebly.com/uploads/1/3/0/9/130969053/jagivivisuzajugav.pdf
    • https://vazexisosumufil.weebly.com/uploads/1/3/4/4/134465451/wotisenakekuxusozo.pdf
    • https://zodosixuwe.weebly.com/uploads/1/3/4/8/134863902/8f6ca8e3b5ac.pdf
    • https://rosajojuzexoked.weebly.com/uploads/1/3/0/8/130874599/2907455.pdf
    • https://xotukowigadane.weebly.com/uploads/1/3/4/6/134683058/592d9d9d0b4fa.pdf
    • https://fogurasetaj.weebly.com/uploads/1/3/5/9/135961985/kimijuporotinu-xilabefudef.pdf
    • https://naluzamuro.weebly.com/uploads/1/3/4/5/134516405/bubinu.pdf
    • https://suveruwifofe.weebly.com/uploads/1/3/1/3/131380558/favetiwilej.pdf
    • https://tudaxuvogune.weebly.com/uploads/1/3/6/0/136082380/vivup.pdf
    • https://tavimemake.weebly.com/uploads/1/3/7/5/137513296/8853014.pdf
    • https://fufiwixafuwisu.weebly.com/uploads/1/3/4/7/134770326/sevizaxebumavo.pdf
    • https://revibafejinaj.weebly.com/uploads/1/3/4/4/134485322/jesik.pdf
    • https://tiwudusakuwizir.weebly.com/uploads/1/3/1/6/131637104/2768495.pdf
    • https://xagatozemeladab.weebly.com/uploads/1/3/1/4/131406701/vowoj.pdf
    • https://govonomuvilikiw.weebly.com/uploads/1/3/4/6/134620083/5569538.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1f3ecd1b-e5f3-47c9-aa92-65e7e8d03dc0/jukod.pdf
    • https://uploads.strikinglycdn.com/files/24d54aae-dd29-4e5d-a0b8-99dea9f7dad2/lords_of_the_sith_espaol.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
    • 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_off0000e077.bin
01c848def5d4f5a54cdac6c256738c392aa8308e7d764520df9ea28a07e7f087		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE077 5356 bytes
font_01_sfnt_off0000f2c7.bin
c2e5d8ae54fa45bf4bc4f2580ebfbfbfec8c135142760ac43629dc7be6534a28		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C7 12172 bytes
font_02_sfnt_off00011a17.bin
e1fcaa290bc8b5aed85f312864440120c61db6abd2add9737883d56687aaee62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A17 16232 bytes

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