Malicious PDF — malware analysis report

Static analysis result for SHA-256 28bae4510f6809eb…

MALICIOUS

PDF

63.8 KB Created: 2020-11-22 18:26:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: adc286bd73008b9fd81aa61f67ecc512 SHA-1: dbf0c1836359138d9619d5adee8fe051879af68c SHA-256: 28bae4510f6809ebdd5ebf0f338d1f2a57d79fcdefba24406429088758150dba
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://traffine.ru/123?utm_term=dna+replication+labeling+worksheet+answer+key+pdf PDF link annotation
    • https://subonotewus.weebly.com/uploads/1/3/4/3/134347286/vazotezawomuko.pdfIn PDF document text
    • https://semopadilined.weebly.com/uploads/1/3/4/6/134696525/6c7108ef3e30f.pdfIn PDF document text
    • https://rogidalot.weebly.com/uploads/1/3/1/6/131636841/wadulami.pdfIn PDF document text
    • https://midunufi.weebly.com/uploads/1/3/4/3/134387712/2930163.pdfIn PDF document text
    • https://mixosikopas.weebly.com/uploads/1/3/4/3/134383158/nexuke.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/66c47c2c-fb30-45a8-ac00-972e531e0686/socialismo_del_siglo_xx1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e67a9c13-c1cf-47fe-8d92-eb8aa5299780/27465976740.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76fd6dbc-6f0c-4ffd-92b2-a2ebe12ebe0b/gonifodapilam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5e8cc0a-b339-42df-b85d-0583d56a8228/knex_rippin_rocket_roller_coaster_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5378c333-ad84-4170-b98e-3c74dff0b5e0/88687339589.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f183fddc-4644-4a04-8b09-6d0e084ca663/wifijudokivetu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b87994fa-fec6-4e69-8bea-a61168e7cef5/xanuwu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aebc504a-b979-472b-86f7-350adaa14f34/kebuso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65b44cc7-1dde-4ec9-acba-49b60f80410e/english_speaking_book.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/26175046636.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_off0000bc97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC97 5816 bytes
SHA-256: e177dc2230e797e4ddcc92a61a34989ba753a3a170fcb603b6508b192880401e
font_01_sfnt_off0000d076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD076 9884 bytes
SHA-256: b629c96393d394ba5a2529332b670b7d6cd60a91d0548aaeaa5809b6d6ce2a8d

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