Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b9d5263cbca5997…

MALICIOUS

PDF

85.1 KB Created: 2020-11-16 16:41:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 08824a74aea869e0d5b4e599eecd31ca SHA-1: d39701fd2a8a836b1f0d8c884edc858029e5c7aa SHA-256: 3b9d5263cbca59975a0123c9a7339315c47c4ae8d623cced78d06400fcadaf6e
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/strik?utm_term=benchmark+fractions+worksheets+3rd+g PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373516/normal_5fa76c22f157b.pdfIn PDF document text
    • https://senapuvuv.weebly.com/uploads/1/3/4/4/134459053/60720.pdfIn PDF document text
    • https://pesawesezopi.weebly.com/uploads/1/3/4/3/134327800/8ed6c0a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402707/normal_5f9688ddd0d45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388428/normal_5f92f086149bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379960/normal_5f9c7d6aec95e.pdfIn PDF document text
    • https://putigazabikikim.weebly.com/uploads/1/3/2/6/132682718/99c98c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381740/normal_5fad268a37f42.pdfIn PDF document text
    • https://xisiwazebisa.weebly.com/uploads/1/3/4/7/134758569/4111619.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/ronatiduzoxij/elaboracion_de_talco_antimicotico.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/best_5_hd_satellite_receiver.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/understanding_computers_today_and_tomorrow_comprehensive_14th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/baseball_arm_stretches.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_off0000fafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFC 5772 bytes
SHA-256: 76c03e24e21c50b1caac855964e9752c62547d147d2daf69d8f442b40c710b72
font_01_sfnt_off00010e8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8A 10200 bytes
SHA-256: 0157d94d5a017db0658ba879751f3b778643863d3732f234760971bb0fe734a6
font_02_sfnt_off000131a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A2 16176 bytes
SHA-256: c392189ff328babef707e661744462cf1107ff2c7c99b7449997d6791772008b

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