Malicious PDF — malware analysis report

Static analysis result for SHA-256 6124ca11c71f7258…

MALICIOUS

PDF

76.8 KB Created: 2021-03-22 16:04:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cedccb887581635b4feffb8f47d63d86 SHA-1: 283e7d34d549e04fef3e2bc28c251e865633cf8d SHA-256: 6124ca11c71f7258d5bddd4ba326dfcc813cf7c5547d62b035f7d480d094bdf7
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to Weebly and other hosting services, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs are indicative of a phishing or malware distribution attempt, likely leveraging a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/wix?keyword=regal+breadmaker+k6750
    • https://pozuxona.weebly.com/uploads/1/3/1/3/131398461/5c00376c8bcae.pdf
    • https://static.s123-cdn-static.com/uploads/4370996/normal_5fc8fb6d87e98.pdf
    • https://garujidizog.weebly.com/uploads/1/3/1/3/131398488/pepupu-xegowanevuz-dodevepojemut.pdf
    • https://cdn-cms.f-static.net/uploads/4369797/normal_60181458545ca.pdf
    • https://cdn-cms.f-static.net/uploads/4412762/normal_5fdc56b580dc8.pdf
    • https://bazafegaxu.weebly.com/uploads/1/3/1/3/131383427/fikisimul_gubetuxa.pdf
    • http://roflan.site/python_3._6._6_64_bit8moz8.pdf
    • https://cdn-cms.f-static.net/uploads/4369653/normal_6035a04d7cc2a.pdf
    • https://cdn-cms.f-static.net/uploads/4497358/normal_5fd5f7b36062d.pdf
    • https://static.s123-cdn-static.com/uploads/4475389/normal_5fc682b248886.pdf
    • http://puzigodemabotod.iblogger.org/wikefav.pdf
    • https://cdn-cms.f-static.net/uploads/4446497/normal_5fd662e8cd268.pdf
    • https://buwipifigidorip.weebly.com/uploads/1/3/0/8/130813409/kuzejevakoralali.pdf
    • http://workbykoder.xyz/jegebudogexofimoduvuleyqq3p.pdf
    • https://cdn-cms.f-static.net/uploads/4424405/normal_5fe9fd124e281.pdf
    • https://cdn-cms.f-static.net/uploads/4447646/normal_601cd3f38232a.pdf
    • http://loleveze.iblogger.org/rotomatogij.pdf
    • https://tiketutowiko.weebly.com/uploads/1/3/5/3/135345961/9163097.pdf
    • http://varietystore.website/xerixorasavapuvotdvitx.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xefejevife/52170049347.pdf
    • https://s3.amazonaws.com/muvevanepen/3274847755.pdf
    • https://s3.amazonaws.com/dinisemowoge/lender_unable_to_pull_credit_report.pdf
    • http://venavabumekaj.epizy.com/86371696986.pdf
    • https://s3.amazonaws.com/bewibiwat/mazomogewad.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_off0000ec0e.bin
c486b1dbef0194fc408729ff7a10a777a2dd554e34f8ee199129f677ead72737		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0E 5680 bytes
font_01_sfnt_off0000ff61.bin
af6626a6060ba6cc8fbdbe3d1e2ebaa332abbb613c752dfe334850f8848677b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF61 11296 bytes

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