Malicious PDF — malware analysis report

Static analysis result for SHA-256 b54c6f107ab30c7f…

MALICIOUS

PDF

72.6 KB Created: 2021-01-29 05:49:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 33fbd042995fabe7a15a9c828dd3445c SHA-1: 2a3b180ecda005e5fd20ad3f6f46527d399ba123 SHA-256: b54c6f107ab30c7fbb151973ca2d93f362e94b38f8193be2e05df3d95ab32367
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, pointing to various PDF files hosted on free web hosting services and cloud storage. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. The embedded URLs suggest an attempt to redirect the user to malicious content or a phishing site.

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://jacksth.ru/123?utm_term=www.ibb.org.bd+89th+result PDF link annotation
    • https://mulafixi.weebly.com/uploads/1/3/4/3/134317856/9947504.pdfIn PDF document text
    • https://dewufore.weebly.com/uploads/1/3/4/8/134857007/5826152.pdfIn PDF document text
    • https://nuvisinuxaxo.weebly.com/uploads/1/3/1/3/131383681/1612cb9d14fa.pdfIn PDF document text
    • https://xebuzoxovekig.weebly.com/uploads/1/3/4/0/134018553/e8fb0c9d.pdfIn PDF document text
    • https://pigikitukapu.weebly.com/uploads/1/3/4/6/134693564/zatijupejarusem_bezemegedonom_tobinobow_gesajutatowo.pdfIn PDF document text
    • https://nukofagola.weebly.com/uploads/1/3/4/8/134883999/8530645.pdfIn PDF document text
    • https://gigufeti.weebly.com/uploads/1/3/4/6/134633464/wibetarelitef.pdfIn PDF document text
    • http://kujazudoxiro.22web.org/luvozokevun.pdfIn PDF document text
    • https://gitufigekuxos.weebly.com/uploads/1/3/4/6/134634758/ca8db.pdfIn PDF document text
    • http://kudezixajuxuni.66ghz.com/wawabinuw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tubasip.epizy.com/kozigebowozarozo.pdfIn PDF document text
    • http://mafofeguf.epizy.com/committee_meeting_minute_template.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/28925718911.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/butterfly_digimon_adventure.pdfIn PDF document text
    • https://s3.amazonaws.com/resisuna/debiruniwubagen.pdfIn PDF document text
    • http://xirokigekokumar.rf.gd/icloud_for_windows_xp_sp3.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/68672494611.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_off0000ddfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFB 5504 bytes
SHA-256: 73882bdfc6f52c77183bead1b1f480dc49f5242a945c2368788902d8399df511
font_01_sfnt_off0000f0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CC 10712 bytes
SHA-256: 3fb54c38bfbf99886f5ba3123ae86da91428499ad5009a189b796645ab6891d7

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