Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a199a32b23f849e…

MALICIOUS

PDF

65.9 KB Created: 2021-02-11 20:05:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 68abb0e0b456c8d9f2de9c75fe559bff SHA-1: f76a890b2b9ee36e58fb409ec8ff962bb1fcb880 SHA-256: 6a199a32b23f849e543306f0630d315d84e2915b059f38fa40ddd89d18a3ce04
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to PDF files hosted on file-sharing services, suggesting a link farm or phishing attempt. The presence of a PDF_SEO_LINK_FARM heuristic firing indicates a large number of external PDF links, likely intended to manipulate search engine results or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://bologen.ru/wix?keyword=velocity+and+acceleration+webquest+answers PDF link annotation
    • https://xanusikufugab.weebly.com/uploads/1/3/4/3/134371049/e15898741f4f1.pdfIn PDF document text
    • https://cdn.sqhk.co/purizepore/30Xdg3d/bovafuwajowubuweki.pdfIn PDF document text
    • https://cdn.sqhk.co/vujejanar/jehbQja/90369123637.pdfIn PDF document text
    • https://dikufakeg.weebly.com/uploads/1/3/5/3/135348043/fafuno-beseveb.pdfIn PDF document text
    • https://batigagonu.weebly.com/uploads/1/3/4/7/134774980/bujit_fivusora_torun_foruf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493227/normal_5ff543b35b2c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501791/normal_6000a03c05d76.pdfIn PDF document text
    • https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/b004731232ab.pdfIn PDF document text
    • https://zadidiboz.weebly.com/uploads/1/3/5/2/135295834/9729935.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/dVlbyid/79217646951.pdfIn PDF document text
    • https://pixufudevolu.weebly.com/uploads/1/3/0/8/130814466/pavologu.pdfIn PDF document text
    • https://vufepuxo.weebly.com/uploads/1/3/4/5/134522835/bazejone.pdfIn PDF document text
    • https://vamawawu.weebly.com/uploads/1/3/0/8/130874524/bc26a8f097d.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/nafibanefexex/8th_grade_math_problems_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/72140061905.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/arabic_keyboard_android_devices.pdfIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/california_shutters_installation_guide.pdfIn PDF document text
    • http://www.brainpop.com/science/motionsforcesandtimeIn 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_off0000c67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC67F 5360 bytes
SHA-256: f9722a247a0a2233e7e6d3bb6772370b64bfc3ae0a5b61898c034c5df7679cb0
font_01_sfnt_off0000d8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D8 9860 bytes
SHA-256: 9d3bad5b1f08c040dc14ffeecd80d843b745bb90cf1301d2e17a83fc0386d3c4

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