Malicious PDF — malware analysis report

Static analysis result for SHA-256 784ed1402c839057…

MALICIOUS

PDF

70.5 KB Created: 2021-01-13 20:04:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: eaeae1568fc273cb21dd290d7ab7651b SHA-1: d47b8320a7ea75e5a47edc6ddc96e91a5d5a248d SHA-256: 784ed1402c839057e7f931ee22d25d295603983ab34c7dc76c97496d1ee0f7ec
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, indicating a link farm strategy to direct users to potentially malicious sites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest an attempt to distribute malware or conduct phishing operations.

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://traffset.ru/123?utm_term=cute+bears+gif PDF link annotation
    • https://gawubodukajine.weebly.com/uploads/1/3/0/9/130969599/5b32bb.pdfIn PDF document text
    • https://kubazabuz.weebly.com/uploads/1/3/4/8/134885093/pugumusemoso.pdfIn PDF document text
    • https://site-1223179.mozfiles.com/files/1223179/nufapagixi.pdfIn PDF document text
    • https://cdn.sqhk.co/baxemazisod/gchggjB/tokesajagexoresegakuj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421466/normal_5ffa6e637d86c.pdfIn PDF document text
    • https://cdn.sqhk.co/naxiwakiwuv/DtjieEe/34606014051.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420924/normal_5f963c8074e71.pdfIn PDF document text
    • https://site-1174390.mozfiles.com/files/1174390/download_clash_of_clans_mod_apk_unlimited_troops.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459785/normal_5fe56788d3504.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/mexijegedakol/maiden_dota_2_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/the_remainder_and_factor_theorem_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/cost_accounting_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/jonora/90324530587.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE30 3156 bytes
SHA-256: 94c11a3263950514a42fcfcb7a44ea7778fbe060570c308504351fcde15986a0
font_01_sfnt_off0000d952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD952 4948 bytes
SHA-256: 7f611f1693ace25782a761f746e9a33eafcb0d903e29731356a9969bc0241983
font_02_sfnt_off0000ea32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA32 10288 bytes
SHA-256: e5466a75fad54097a509fea4358b65c3aba755231349fa57be87dd351074bb1d

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