Malicious PDF — malware analysis report

Static analysis result for SHA-256 b09de21f98b587ca…

MALICIOUS

PDF

70.7 KB Created: 2020-11-19 19:25:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 1ca7b7a86b0401338e94f0d067bfe573 SHA-1: 7ceafcf5443d44b7f0d1a1424b87ccbd64964e06 SHA-256: b09de21f98b587cabd3dcb8a88d46c102a01fc107fcd65cdc02c9b67f775c0c7
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains multiple external links, with a significant number pointing to Weebly-hosted PDFs, suggesting a link farm or redirection strategy. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the presence of embedded URLs and the PDF structure itself are indicative of malicious activity, potentially leveraging embedded JavaScript for redirection.

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://traffset.ru/123?utm_term=worksheet+law+of+cosines+and+sines+a+6-3 PDF link annotation
    • https://gizuxafonot.weebly.com/uploads/1/3/4/6/134619773/4195074.pdfIn PDF document text
    • https://kerizivol.weebly.com/uploads/1/3/4/6/134665291/wivitasi.pdfIn PDF document text
    • https://nulosogitizibe.weebly.com/uploads/1/3/4/3/134317173/4022248.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377095/normal_5f8ff5f5c16a0.pdfIn PDF document text
    • https://baminivosawu.weebly.com/uploads/1/3/4/7/134701136/siwenis_nolokit_godareda_gakaxan.pdfIn PDF document text
    • https://jopalezaleloloj.weebly.com/uploads/1/3/1/3/131380469/sutuzuwo.pdfIn PDF document text
    • https://kekipefawaro.weebly.com/uploads/1/3/4/5/134588225/rimofedure.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/xugigabitulu/88530458635.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/24613651935.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e841bb3-0826-4b2f-899f-29cb5d204df9/29991465950.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eebe6ed4-38a0-4695-b2b4-c013908245ce/vekufilezopisebaduwe.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/vigifozupitevipafudaleb.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/kuxevut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0813917-78da-4f15-b118-374f4a749da0/vomokuvikegejokedopa.pdfIn 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_off0000d87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87A 5628 bytes
SHA-256: b1c97cb93af0599c9c36a6760dffb8e978ce3897379f5535e2250e1481a8e887
font_01_sfnt_off0000ebc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC7 9912 bytes
SHA-256: 2fca43ddee0146386100b6b5a3b0462b576d38472fe97b6348f2758b00f27092

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