Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6fa253961cebd8d…

MALICIOUS

PDF

86.1 KB Created: 2021-03-14 22:12:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: b0aa577e53819dc444262355bf1bff71 SHA-1: 2882e96d0ad07eb3b2fa266c51c3c369c49f1ec9 SHA-256: c6fa253961cebd8da6f6a659c472bdb2ecd78d9b3a478b874d6c0ca6dd624dd8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which are SEO-themed, suggesting a link farm or SEO poisoning attempt. The primary URL, 'https://maypoin.ru/award?keyword=ibm+aix+commands+pdf', is presented as a search result, indicating a likely phishing or malware distribution lure. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious intent, as confirmed by ClamAV and ML detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/award?keyword=ibm+aix+commands+pdf PDF link annotation
    • https://cdn.sqhk.co/zebenane/YEhha1f/63064193587.pdfIn PDF document text
    • https://cdn.sqhk.co/levowexesu/eojbbjH/real_simulation_experience.pdfIn PDF document text
    • https://bonuxomudod.weebly.com/uploads/1/3/2/8/132814593/nafigoneger.pdfIn PDF document text
    • http://wegisinebirixe.iblogger.org/58832484833.pdfIn PDF document text
    • http://mozodulo.iblogger.org/97772833886.pdfIn PDF document text
    • https://cdn.sqhk.co/medujebukoma/ekyLiMS/dune_der_wustenplanet_1984_trailer.pdfIn PDF document text
    • https://xulasimij.weebly.com/uploads/1/3/2/8/132814518/a4b185cf63dbe.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/dinisemowoge/bitdefender_box_2_user_manual.pdfIn PDF document text
    • https://1cd0d4d5-11d4-440c-a307-81f73801f601.filesusr.com/ugd/f0e51d_cc71bbf766c34bc0a36283ba65a7a28f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gezetega/what_are_the_interview_questions_for_finance_manager.pdfIn PDF document text
    • https://s3.amazonaws.com/popisiburewixuj/xejumifupovumiju.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/java_jre_free_64_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/lowebemuwojiso/lakavatugufosavufom.pdfIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/organic_chemistry_naming_compounds_worksheet_with_answers.pdfIn PDF document text
    • https://f7690f66-1871-4559-97e0-239dee5b15da.filesusr.com/ugd/d2cc1f_5e4435c4486e4b3e9b6bf811cbf87fca.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_off000112d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D7 5316 bytes
SHA-256: 3cb56ad454f1aeeba4a7c3332cc243e37c49cb0acf1eef32631eb1e4126e6c16
font_01_sfnt_off000124db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DB 11452 bytes
SHA-256: 9c9877f77ef25fbd5b571beb4c42b0e851789f6ec84df0b2c8e1ca2759da9c06

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