Malicious PDF — malware analysis report

Static analysis result for SHA-256 e277e95a4f0a5cba…

MALICIOUS

PDF

57.7 KB Created: 2020-11-21 06:31:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 8f221125bb157753f719963c5aa73077 SHA-1: 063652ccea94afd54bf0c7e0eeb2f51b43bef903 SHA-256: e277e95a4f0a5cba02cf90acc4ab81feb463d6dd9e948f988060b60d4b98c65a
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 pointing to S3 buckets, which is characteristic of SEO link farms used to manipulate search results or distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing or trojan distribution. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to potentially harmful sites.

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://traffset.ru/aws?utm_term=chennai+gana++song PDF link annotation
    • https://funiwulew.weebly.com/uploads/1/3/2/8/132814073/38435ac0e.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/nuxomigo/basecamp_mobile_app_android.pdfIn PDF document text
    • https://s3.amazonaws.com/dojonuta/pipej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d81be08d-e127-432c-a123-242e8e42fffc/guardian_technology_component_hd_63154.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/reduce_file_size_mac_colorsync.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/pedamelefowumuwevef.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/zerapepabilowokudu.pdfIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/57118421471.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a524bc20-8a7a-4db2-8a2a-d379afdace13/moxelobez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cfc7adb-1014-48ee-a4eb-6e85d6df6421/rixafenevoxiboramujego.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/68118458595.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/fafixopij.pdfIn PDF document text
    • https://s3.amazonaws.com/metakibeme/y8_games_play_free_online_games.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/kotakigokopataxepobi.pdfIn PDF document text
    • https://s3.amazonaws.com/bawalidamovidud/contractor_certificate_of_completion_template.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_off0000ab11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB11 4724 bytes
SHA-256: b987c26009dd351a120d70303b14ef82345c6de2aa3b19c502389da352e0badd
font_01_sfnt_off0000bb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB21 9120 bytes
SHA-256: e59c93d337f19f39e9c74b818795fd3b75e3e4f331295461900be5b0f29d51ff

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