Malicious PDF — malware analysis report

Static analysis result for SHA-256 4000b3ff2ed8199e…

MALICIOUS

PDF

71.4 KB Created: 2021-03-25 17:13:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f440a36bcd0664fd5fa95e170f360497 SHA-1: b1a2931e371c6b5173adcd22d0d24c8141156058 SHA-256: 4000b3ff2ed8199ef61e7892f774690d6d98a8dca9f999f8188177a5b1db291f
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 0.9996

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://golowaki.ru/strik?utm_term=how+to+change+the+language+on+a+pioneer+carrozzeria PDF link annotation
    • https://jufukakoxojopop.weebly.com/uploads/1/3/4/3/134317893/laxibavigiban.pdfIn PDF document text
    • https://wefapewirevuvik.weebly.com/uploads/1/3/4/6/134667644/7314715.pdfIn PDF document text
    • https://senolotazafam.weebly.com/uploads/1/3/4/5/134597296/5317265.pdfIn PDF document text
    • https://sodapovi.weebly.com/uploads/1/3/4/4/134494820/wunusuzega.pdfIn PDF document text
    • https://vobokalonumenu.weebly.com/uploads/1/3/4/6/134656332/2946706.pdfIn PDF document text
    • https://kulaxewanugig.weebly.com/uploads/1/3/1/3/131384484/jamudirumelezewumu.pdfIn PDF document text
    • https://libakitaxejadeg.weebly.com/uploads/1/3/4/0/134096258/8424927.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8d6920c1-aef5-45ed-b1a0-e693d63948fb.filesusr.com/ugd/0a593f_4856e23b52c947539baf0c07cbacb81b.pdf?index=trueIn PDF document text
    • https://af18ad75-7652-4b25-b9e0-8da5fded0af1.filesusr.com/ugd/529385_6405527d1d0745e4a0d3f84d5b56a05a.pdf?index=trueIn PDF document text
    • https://39dd5e1d-a581-41ec-a80f-9e19245c660f.filesusr.com/ugd/c2656d_fce8b7368639430ab7802dbac1a54877.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/niporofez/funny_logical_questions_and_answers_in_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/88588721567.pdfIn PDF document text
    • https://s3.amazonaws.com/wegemebufojafak/subsistence_fishing_guide.pdfIn PDF document text
    • https://36d3fe4d-ce77-4ecd-ae21-04b42370c250.filesusr.com/ugd/871c54_b9143a22ddcc42d49d0360db5a162935.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/veledabejufi/6.0_powerstroke_service_light.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99594b2d-6f8b-4504-b7b0-e7bf712749f9/english_learning_course_free_online.pdfIn PDF document text
    • https://d427386d-3434-45d9-8802-370857a594f4.filesusr.com/ugd/accd1f_d9ad9164248d4d4583c34d1f93eddd05.pdf?index=trueIn PDF document text
    • https://d321836a-1bf8-47c4-b4d3-67fe1e7f0250.filesusr.com/ugd/33ab24_775a37a4a763442f824f17684cab7103.pdf?index=trueIn PDF document text
    • https://ee897e78-a157-4eb5-8a47-d615096087a2.filesusr.com/ugd/113e89_ab57ca5154a64cc39add8cd8a6804854.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ragejufa/brigette_hyacinth_the_future_of_leadership.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2c84eec-bdf1-44fc-a2db-93137375e097/misuniwezopig.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_off0000d833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD833 5120 bytes
SHA-256: e43b10a9c448189fc8cc4589b63a2a696e22ff687a3c811f94e29d3de70bd511
font_01_sfnt_off0000e9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B7 10768 bytes
SHA-256: b70a9e5661496831b65eafd01e198366873c8c0c9c4bfd19822763225b09772e

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