Malicious PDF — malware analysis report

Static analysis result for SHA-256 b39d5cc23dd78d09…

MALICIOUS

PDF

75.0 KB Created: 2021-01-05 21:10:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 6f95917065e59ba0116d77ad0ba54fbe SHA-1: 12b1a97c1dae5bfefa985aedb0c6949219df07c3 SHA-256: b39d5cc23dd78d09cc67dcb7a4bc4bdcbca2d09c25f6397e581404fd1f98d807
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the overall structure strongly suggest this document is part of a phishing or malware distribution campaign, likely initiated via spearphishing.

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://trafftec.ru/aws?utm_term=4th+grade+multiplication+facts+worksheets PDF link annotation
    • https://pemezexuz.weebly.com/uploads/1/3/4/5/134585882/tijiwugifaforama.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393511/normal_5f9eec3a12426.pdfIn PDF document text
    • https://nuruvubapifak.weebly.com/uploads/1/3/1/4/131452890/xopepuzoberajas_vexaralur_tevoj_ditejesujodived.pdfIn PDF document text
    • https://nibojesuko.weebly.com/uploads/1/3/4/3/134329062/89ffd6ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366389/normal_5fa15e060b2db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383334/normal_5fc14acf2a250.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403415/normal_5f9cca620dfc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484993/normal_5fb9dd54e904f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421341/normal_5fc3025bc9ff8.pdfIn PDF document text
    • https://wosubazaroden.weebly.com/uploads/1/3/0/8/130813518/4314470.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372384/normal_5fc0a58a9d490.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2dc7a60-38fc-4f13-ab88-1f0b0b55e70e/unblocked_unreal_pix_city.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29843851-a95b-4255-9938-11415fe106f7/dobaduxiwunitaw.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_off0000e581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE581 5716 bytes
SHA-256: ab22aa28a79fc7fe6cbb79ac12261b9d751adfb5914342c73948a3050c01df54
font_01_sfnt_off0000f8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E7 11108 bytes
SHA-256: 13d383da81e212df9222736531391aa3d19fc8308d057f750430a0fc812cf1c6

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