Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9db4f00412f1bae…

MALICIOUS

PDF

72.0 KB Created: 2021-05-31 20:32:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 51238a34931171f86245de7b352167cf SHA-1: 722df89c26521c107a2f82851032c21166754e3b SHA-256: a9db4f00412f1bae86186005769e1b89e695c051f6bb9c6d21c95b3e6ecf3e39
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links to external websites, many of which are hosted on Weebly and appear to be part of a link farm designed to distribute PDF files. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing and trojan activity. The presence of embedded URLs and the heuristic firing 'PDF_SEO_LINK_FARM' suggest a campaign to drive traffic to malicious sites, likely for malware distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/pbw?utm_term=los+paises+hispanohablantes+crossword+puzzle+answers
    • https://kiwuvewe.weebly.com/uploads/1/3/7/5/137509443/bemumusidake.pdf
    • https://posenumu.weebly.com/uploads/1/3/0/7/130776111/6832568.pdf
    • https://toguxiwo.weebly.com/uploads/1/3/4/6/134645105/df6eb.pdf
    • https://xoxisutebigag.weebly.com/uploads/1/3/1/4/131453062/05250841c.pdf
    • https://cdn-cms.f-static.net/uploads/4369504/normal_6015ee96c2613.pdf
    • https://static.s123-cdn-static-d.com/uploads/4467017/normal_60affeda935ab.pdf
    • https://cdn-cms.f-static.net/uploads/4387565/normal_60217b97d8f29.pdf
    • https://cdn-cms.f-static.net/uploads/4407316/normal_602d203de8778.pdf
    • https://cdn-cms.f-static.net/uploads/4369309/normal_605fa0da76ac9.pdf
    • https://cdn-cms.f-static.net/uploads/4489988/normal_601230a92e429.pdf
    • https://static.s123-cdn-static.com/uploads/4403951/normal_5ffce392a057c.pdf
    • https://cdn-cms.f-static.net/uploads/4411681/normal_605a764676bbb.pdf
    • https://xuvibelatubeni.weebly.com/uploads/1/3/5/3/135306186/lejetexijewez.pdf
    • https://sovakevu.weebly.com/uploads/1/3/4/3/134341498/jomovabeton_bajemul_rijukafij.pdf
    • https://pojixaguwor.weebly.com/uploads/1/3/1/4/131453565/3210269730.pdf
    • https://rowopubogapog.weebly.com/uploads/1/3/4/2/134234702/7324916.pdf
    • https://bakasilamor.weebly.com/uploads/1/3/1/4/131407315/zakudekover.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/191abc7b-ca0c-461f-b27e-67b421b59e86/juvebekigejilew.pdf
    • https://uploads.strikinglycdn.com/files/5f69fbe4-5e15-49a2-b4ea-6e1f78154667/how_much_do_autocad_software_cost.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc61.bin
a7a6d53ffc7b9ce6e46ceb09ece204b7b7a7dd2c6ed077b1fac78c0cb98bb2b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC61 5384 bytes
font_01_sfnt_off0000eebb.bin
8b3f843cce9fc0861ee83d1630580018db3faa3eb259e95f232155d033d08748		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBB 10296 bytes

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