Malicious PDF — malware analysis report

Static analysis result for SHA-256 841db1cd45aa504e…

MALICIOUS

PDF

72.6 KB Created: 2020-11-25 18:58:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: e1b6537ef2f94a3f8ff8c4b432f2362f SHA-1: bd5d22f66375842bb5402b9be6a841bce5fe2719 SHA-256: 841db1cd45aa504e2e19dec2f710434c98c3960a97afff5418fdfdca8b7d1d32
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. The presence of numerous external links, many pointing to Weebly-hosted PDFs, suggests a link farm or phishing campaign designed to redirect users to potentially harmful content. The ClamAV detection further supports its classification as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=scholarships+4+kats PDF link annotation
    • https://wikamarelifegef.weebly.com/uploads/1/3/4/3/134380256/8672796.pdfIn PDF document text
    • https://wedebiki.weebly.com/uploads/1/3/0/9/130969436/vivutotozusipaf_jomuriboxavib.pdfIn PDF document text
    • https://terarawuterojuz.weebly.com/uploads/1/3/0/7/130739827/1249403.pdfIn PDF document text
    • https://zadumeredevasax.weebly.com/uploads/1/3/1/4/131453870/3920091.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475997/normal_5faefb41045e6.pdfIn PDF document text
    • https://xadudimomo.weebly.com/uploads/1/3/4/1/134131791/638065.pdfIn PDF document text
    • https://nutofuwinoxa.weebly.com/uploads/1/3/4/7/134719482/dusafinakix_gidolukufos_diduvubi.pdfIn PDF document text
    • https://kilunifogewawo.weebly.com/uploads/1/3/4/4/134457757/e5066.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366348/normal_5f8852cbd3f89.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/dutimajizowa/sqlcode_911_sqlstate_40001.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/free_asc_timetables_full_crack.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/43392018541.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/eclipse_ide_2019_06_zip.pdfIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/54543354925.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA92 5276 bytes
SHA-256: 4f476c3d3bccda638ce6fe82862f863712818536bb052b65a95ed55136402486
font_01_sfnt_off0000dc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC86 10924 bytes
SHA-256: c712779d5852cbdef4e423c23171fcf0246172fb892f9efd97d8a7f1aad60f10
font_02_sfnt_off00010111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10111 16060 bytes
SHA-256: 2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90

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