Malicious PDF — malware analysis report

Static analysis result for SHA-256 9df99ea4f5f64c0e…

MALICIOUS

PDF

69.9 KB Created: 2020-12-02 15:44:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: d2b9e77bab956f1dbf413b273eae34df SHA-1: d771148766025fd9863b44f128ce8496efaec998 SHA-256: 9df99ea4f5f64c0ecfd2c111fa3541e2e5c4e4d908a22c771d4fc442c447c98a
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 0.9997

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://traffine.ru/123?utm_term=minecraft+kill+all+mobs+command+1.16 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366063/normal_5f9397aff3c90.pdfIn PDF document text
    • https://bebejumupetokox.weebly.com/uploads/1/3/4/5/134513190/1818782.pdfIn PDF document text
    • https://kinoxumore.weebly.com/uploads/1/3/4/4/134463035/6313876.pdfIn PDF document text
    • https://jonolepazom.weebly.com/uploads/1/3/4/5/134520471/3279542.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417809/normal_5f98ef9ea2d61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369904/normal_5f8903253a228.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403418/normal_5fbf2b7930af9.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/a2426963-f912-49b6-b828-148643c83132/589835378.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6461ac7e-4921-43f1-9686-5830ddb1e7d3/pafuzejidaroxuxolimub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cdb2236-06b9-47c1-8a9d-f8d3f6a0e70b/xafibitazo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4738c79-7421-4f2a-a873-5343a4392aab/addition_and_subtraction_of_decimals_word_problems.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/igcse_business_studies_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/zugirurevosatubukazu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbb610f3-4ca3-485f-b546-34341414958b/slang_for_drunk_urban_dictionary.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_off0000d14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD14A 5612 bytes
SHA-256: b1e9933c68734fb98ad1372f18af91f7231cc9e7a574d355eb4d635301221145
font_01_sfnt_off0000e467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE467 11216 bytes
SHA-256: b387aebaf99066df27eb9d01693d3583123dc3adb34162423433f4b03bd3180f

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