Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdb450ee8ceca773…

MALICIOUS

PDF

71.2 KB Created: 2020-12-20 01:57:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 17ffda74984b2f8492ae95ad2baba3c6 SHA-1: d09d12be1fabf78420dae97f3847af20effb084b SHA-256: cdb450ee8ceca7736863b6c3220b3128d36282706d3d5e99236f91354047fcd7
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, with at least one identified as a malicious redirector and others forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were extracted, the presence of numerous links and the malicious redirector suggest the document is designed to lure users to malicious sites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=commedia+dell%2527arte+characters+lovers In PDF document text
    • https://pekireraseg.weebly.com/uploads/1/3/4/7/134720831/8485986.pdfIn PDF document text
    • https://mufalugibesenu.weebly.com/uploads/1/3/1/4/131453255/vojoxawodufudesakax.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482645/normal_5fca4512e7e76.pdfIn PDF document text
    • https://kirewigofe.weebly.com/uploads/1/3/4/3/134382955/8798174.pdfIn PDF document text
    • https://zujomesesewega.weebly.com/uploads/1/3/4/9/134902804/5695184.pdfIn PDF document text
    • https://jufozovujibozom.weebly.com/uploads/1/3/4/3/134360308/zupazemewedazavum.pdfIn PDF document text
    • http://www.delpiano.com/carnival/html/innamorati.htmlIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc726358651a0475196622d/t/5fd6e45a0f11661d4c3f480c/1607918682736/af_full_service_dress_uniform.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc140152cf09257bd6e62db/t/5fc5d5bb173fb5383b6db448/1606800828054/wajufexosisaxebibi.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdd2b8fd7fbea164c2cd44a/t/5fdd70efa3b92b153c0d8adc/1608347890572/bhakta_kannappa_songs_com.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/979ef6f3-1205-49e4-bddc-187ab6f282ed/engineering_vibration_solution_manual.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe3a314f98375720aba485/1606302257360/38500328570.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdc800ff65a9a5fd4920f89/t/5fdc9fcd3bd3a53b5e8baf9e/1608294349913/nivipekotedave.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_off0000d927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD927 5176 bytes
SHA-256: e70907d1167745bec8aac7cf78ddbb3dc2cccc5fb81730b40345ec95078bb47b
font_01_sfnt_off0000ea99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA99 11144 bytes
SHA-256: 820c85e99217134dd14c73522cd1f3c4782d6160d6aa88684aeb2802ad268314

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