Malicious PDF — malware analysis report

Static analysis result for SHA-256 58dd2975005803f9…

MALICIOUS

PDF

81.7 KB Created: 2021-03-12 08:26:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 8681e3a2770f668ab4017bbd8694173e SHA-1: 2f9eb9b54708cc77e9e23cfe68ec24b358439983 SHA-256: 58dd2975005803f98bab15256ba73a3064e421adfce61e221571a48eb2ae1e2e
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-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://bologen.ru/123?utm_term=chiari+malformation+radiology+ppt PDF link annotation
    • https://cdn.sqhk.co/ketixudolu/if2p2gg/servsafe_test_results.pdfIn PDF document text
    • https://cdn.sqhk.co/nexasolonit/eT7gghQ/bajujuripuvinopaveso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402720/normal_60289d5ec7852.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/BhgrIKi/crypto_wallet_app_android.pdfIn PDF document text
    • https://cdn.sqhk.co/bidogefapo/heBgegf/alien_swarm_game_free_download_for_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417658/normal_60141c0cd8b99.pdfIn PDF document text
    • https://cdn.sqhk.co/kedilexele/jhx54gh/simple_business_plan_template_free_for_students.pdfIn PDF document text
    • https://cdn.sqhk.co/kepigofunet/hdM6Uge/palixijeladozarevegase.pdfIn PDF document text
    • https://cdn.sqhk.co/rurufimibiwe/jdiIggi/miwizofewusetowonif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452376/normal_60445d27d1cb4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b2f02272-107b-4032-aafc-54cdd6265a16.filesusr.com/ugd/6cf392_01893a1568a84602a1d541525aae81a6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dozuga/gusobutuber.pdfIn PDF document text
    • https://40ba1f7a-6e91-49bb-bbb8-dfbb40a2bc60.filesusr.com/ugd/22bf55_8ed90a2fc71a45b8b56a1a28a93bb18f.pdf?index=trueIn PDF document text
    • https://24451074-f53b-4065-993c-779ba3957988.filesusr.com/ugd/0ae25f_ef76e3d8d63d4ba3940f4b75de4a9f54.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wizomoravazub/mathematics_grade_7_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/whatsapp_gb_anti_blokir_versi_terbaru.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_off000102f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F1 5284 bytes
SHA-256: 96374d0f24bca6334cf08ede8e521e59a90129f218a07f5c7f038d7685ffbf49
font_01_sfnt_off000114c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C9 10732 bytes
SHA-256: 933a839cde612b7004ea370e74af0b3dd0b4cee8a998c48197ac8b1cc073d25b

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