Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc47ad728db8dfac…

MALICIOUS

PDF

75.2 KB Created: 2021-02-10 19:38:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9e184e91362da2de075dd36aa021a1fb SHA-1: acd85fccd20951586401b96ff5fd6865298b2f02 SHA-256: bc47ad728db8dfac6bd85c8729e1073b7fec97b248d529e51d6a34cba034a71d
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 point to other PDFs, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest the document is designed to trick users into downloading further malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/aws?utm_term=jazz+piano+sheet+pdf+free PDF link annotation
    • https://kakifimetuwojo.weebly.com/uploads/1/3/4/3/134317364/143.pdfIn PDF document text
    • http://livecopyrightverification.com/2808749457zcrhf.pdfIn PDF document text
    • http://kotuputepoworug.22web.org/muzezitapoxubalalejidex.pdfIn PDF document text
    • http://voicebftyi.com/bluetooth_win7_suite_for_hp4in6v.pdfIn PDF document text
    • https://gijesilikisuzid.weebly.com/uploads/1/3/2/6/132683000/5536743.pdfIn PDF document text
    • http://imm-shoes2.club/pe_exam_study_guideyzb7u.pdfIn PDF document text
    • https://kenemujawov.weebly.com/uploads/1/3/4/6/134645985/zisipoputaxaxe.pdfIn PDF document text
    • https://tinuvireredat.weebly.com/uploads/1/3/4/8/134864568/8197270.pdfIn PDF document text
    • http://liwokat.iblogger.org/12405255867.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/sojebelevenex/wral_weather_report.pdfIn PDF document text
    • http://xojazexodiwosi.epizy.com/42748301392.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/gebubilafilaboda.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/zomimagutifuv.pdfIn PDF document text
    • http://nekogepi.epizy.com/waxokekojuwapirupog.pdfIn PDF document text
    • https://s3.amazonaws.com/lowebemuwojiso/hillsborough_county_public_schools_electronic_report_cards.pdfIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/55189546528.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/10936382779.pdfIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/indesign_free_magazine_templates.pdfIn PDF document text
    • http://bavidoripo.epizy.com/modulo_anamnestico.pdfIn PDF document text
    • http://dizavinizekabos.rf.gd/tedanatikejudixega.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_off0000ea25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA25 5136 bytes
SHA-256: c529c52615e5057eb75171870141071c7967fc21118947229fc4f5854d44b622
font_01_sfnt_off0000fba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA6 10664 bytes
SHA-256: 96cbadee373db72816e3ece61a261ac9b831fa3183ae0849b000ae506ba0d0da

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