Malicious PDF — malware analysis report

Static analysis result for SHA-256 08264b4f78e8fc51…

MALICIOUS

PDF

95.5 KB Created: 2021-03-31 19:22:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f8e8e53d4d7c60bbdec83a1633c52859 SHA-1: d6051f45b26d24134f26a0044275156adfc61c25 SHA-256: 08264b4f78e8fc51f1f0190e98fd23ead1e598efa86e3c8ab4d3c9ffb27a2eac
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 0.9998

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://dafemum.ru/award?keyword=drogas+anticonvulsivantes+pdf PDF link annotation
    • https://cdn.sqhk.co/doporaba/yii3rCU/defakutisu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369912/normal_5fde48bf457ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392451/normal_60372bf79a748.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448103/normal_5feb6a4de2bb4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369643/normal_60020ccbba756.pdfIn PDF document text
    • https://cdn.sqhk.co/lejesapazud/6VgZpAS/download_aplikasi_fire_balls_3d.pdfIn PDF document text
    • http://beramomu.22web.org/detawipenetezumeguma.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411937/normal_603e6c95108cd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391634/normal_5ff6830c5dd9d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469617/normal_5ffdef29a77c7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://42cc6f6d-9125-48bc-bce4-1bf15f49b1be.filesusr.com/ugd/7c30af_df5c47fafc364879ab63c4d119088639.pdf?index=trueIn PDF document text
    • http://gezojetisab.epizy.com/8529449230.pdfIn PDF document text
    • http://wekidezeze.epizy.com/pivevexozu.pdfIn PDF document text
    • https://204833c8-abda-4421-8777-5048ee7dd919.filesusr.com/ugd/e30b7a_a6ae95f28ac84d7b9160aa758e687dc2.pdf?index=trueIn PDF document text
    • https://d52369c8-37f2-40d9-9d5f-d682b3b4a2e4.filesusr.com/ugd/6d5a7b_94a1606c312c4e8fb540afa689368cc8.pdf?index=trueIn PDF document text
    • http://takoxiwewol.epizy.com/50689230373.pdfIn PDF document text
    • http://fumosuwigerama.epizy.com/39765482955.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_off00013558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13558 5384 bytes
SHA-256: 85d84b87fb7b40a427cc2d6b639a0e0e5e553f8273e08be910a335e734e3b564
font_01_sfnt_off000147c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147C5 13248 bytes
SHA-256: f341a9eebfbf52ede7975b1ee4395182c391915e6fc4324ee2632836e81007cc

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