Malicious PDF — malware analysis report

Static analysis result for SHA-256 187a90e04d8e0761…

MALICIOUS

PDF

74.0 KB Created: 2020-12-22 10:12:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ddf944b68a021a165a8c57b19a82166b SHA-1: d6a0ae0e59678aebd99422f596aa40bffaca14d0 SHA-256: 187a90e04d8e0761c0ccdb707ab49daf92bed6cc19fc675e1a8f6d338ee731f9
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, including a known malicious redirector and a link farm, indicating an attempt to direct users to potentially harmful content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of exploitation for client execution, potentially via embedded JavaScript or other exploits.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/123?utm_term=algebra+1+chapter+7+test+form+b+answers In PDF document text
    • https://zegekeli.weebly.com/uploads/1/3/4/6/134616407/2d3a67f9.pdfIn PDF document text
    • https://sibakixode.weebly.com/uploads/1/3/2/8/132814768/puwep-jusulanafuro.pdfIn PDF document text
    • https://funogumoduwe.weebly.com/uploads/1/3/4/3/134309977/3144726.pdfIn PDF document text
    • https://fetesebi.weebly.com/uploads/1/3/4/8/134896421/vinerewavezi.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/kakekojezutok/wireless_av_sender_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/air_force_game_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8960171e-e77f-43e7-a12a-66b217e978d0/zaxogurog.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/aquarius_man_capricorn_woman_yahoo_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/nalifij/classroom_management_philosophy_ideas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07edbc94-e0d2-4779-8209-e38743e99221/fopege.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/29710563588.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdd3a8a51e6b539731b098d/t/5fde512e42c0045a33f6f5f9/1608405296083/channel_3_weather_report.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabisura/41563802067.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc51087c6229360ecc7aa43/t/5fd040040c0c9b10ab021cbb/1607483396422/x_core_galactic_plague.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_off0000df6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6A 5784 bytes
SHA-256: 1427c8baa64033230115f72e9449457271cb881a2582cf7278fa43f870865320
font_01_sfnt_off0000f315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF315 12224 bytes
SHA-256: 2a74c52a7ea78ec8d5dead8b0e0e38c27090c5e76e141ab566963107206b3fe2

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