Malicious PDF — malware analysis report

Static analysis result for SHA-256 9caf6ca6dd8a4b90…

MALICIOUS

PDF

97.7 KB Created: 2020-12-27 08:53:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8a4d9c54a22757ef227dba118205be13 SHA-1: b3300e75de527fc12434c75c5e733c314f4c293a SHA-256: 9caf6ca6dd8a4b904f76fc7dd4f477351264fb82dfaba8998eeaab3e8b47c9ac
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for a link farm containing 26 external links. The ML classifier also returned a high confidence score. The primary attack pattern involves directing users to numerous external URLs, likely for phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafftec.ru/123?utm_term=sue+sue+in+the+city PDF link annotation
    • https://wapunukipebew.weebly.com/uploads/1/3/4/4/134440940/6661000.pdfIn PDF document text
    • https://vafarisitoguv.weebly.com/uploads/1/3/0/8/130874489/denozuxoremare_dalabebimudevi_zitosewip.pdfIn PDF document text
    • https://zupeloniz.weebly.com/uploads/1/3/4/0/134018773/536bd.pdfIn PDF document text
    • https://cdn.sqhk.co/pavujakorige/jgg0Lgd/89921060380.pdfIn PDF document text
    • https://cdn.sqhk.co/gemadaruvow/HPihhdJ/the_ant_colony_movie.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423700/normal_5fdc45dc56c85.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500887/normal_5fcec226ddfa2.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/gotijejaj/secret_world_legends_classes_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/elektron_analog_heat_mk1_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea6b6da2-e095-46cd-846a-cc4e30b85c3f/14267864240.pdfIn PDF document text
    • https://s3.amazonaws.com/potamotaz/82816569245.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/nopinutarogagikum.pdfIn PDF document text
    • https://s3.amazonaws.com/fasudikek/pewter_report_tampa_bay_buccaneers.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00015732.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15732 20544 bytes
SHA-256: 10613ffb0e8ea1003d8bcd90871e8bd161f7b4742eadf4744059ebeac7c7ee0f
font_00_sfnt_off000120c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C7 4756 bytes
SHA-256: 4ce23929a7e25cd91d4eb4a47f5175f1e1a32a71043394e2d490aab435b496b3
font_01_sfnt_off00013102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13102 11160 bytes
SHA-256: 52fb8a5b846a76c56fbc306165641daf11b72a22abb666fffe2423beecd15604

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