Malicious PDF — malware analysis report

Static analysis result for SHA-256 5750ea8af81dca05…

MALICIOUS

PDF

73.7 KB Created: 2021-03-10 04:47:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 2c2a3b16641fa19fc4eb458cb853f8b3 SHA-1: 5b4098ce1debba85ced33348b35ea53d5b229ca6 SHA-256: 5750ea8af81dca0571c29c4e56dca493b231279f8f6d5edeef91d9ccf15cc2fb
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 0.9960

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://fokemale.ru/award?keyword=actos+de+comercio+del+derecho+mercantil+pdf PDF link annotation
    • https://cdn.sqhk.co/tememukafosu/iDhcrie/sms_gratis_cubacel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365620/normal_5fd32975c131e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503050/normal_60276cc5db461.pdfIn PDF document text
    • https://cdn.sqhk.co/kululojilo/zgdjKhf/37137218069.pdfIn PDF document text
    • https://cdn.sqhk.co/pifonode/Fgc5igd/papa_s_pizzeria_game_online_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/pedidagow/ahb6qdj/how_to_bake_spaghetti_squash_in_oven.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417312/normal_603395d933594.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475861/normal_60110ab6279f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393631/normal_604658bde8fd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389355/normal_6033d40235ad6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475406/normal_603408e9005f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473044/normal_601090b569af1.pdfIn PDF document text
    • https://cdn.sqhk.co/gixedomawa/FfhgChi/poxerawubuduzaveridow.pdfIn PDF document text
    • https://cdn.sqhk.co/zelosoza/Zljhyl3/sezixopipunu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475854/normal_5fcaf0f18c33f.pdfIn PDF document text
    • https://cdn.sqhk.co/viwiratoposu/6jd73kf/human_fall_flat_xbox_more_levels.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382208/normal_5ffa73127c31f.pdfIn PDF document text
    • https://cdn.sqhk.co/tezikegoj/eZNLgjh/67803451769.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/bitajemisajoz/31807732352.pdfIn PDF document text
    • https://ed8bc375-cd54-49ab-9ddb-988cb5b2fc3d.filesusr.com/ugd/3f3824_02765e0132a24d38847502a2efffbed1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/wijomarukivomepejewo.pdfIn PDF document text
    • https://2ffa788b-df2f-461f-b9c5-573bec542745.filesusr.com/ugd/374ce0_ba83ec5a4c4b4bb5a72763cef124069d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nademopor/49093770304.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/fuzobok.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/72680408198.pdfIn PDF document text
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_02c665ba2521453f8347c51575a885ea.pdf?index=trueIn 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_off0000e061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE061 5384 bytes
SHA-256: 1b6287a818468be395e8ae81584ab523de9c340ad6a67be54cf50ea3b9eec72f
font_01_sfnt_off0000f283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF283 11140 bytes
SHA-256: af3dcd03d89d8618a6cef93c25668d38d3a8f2c9c27b8304a8f154e9841dc8e1

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