Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb11956a57474736…

MALICIOUS

PDF

68.8 KB Created: 2020-12-18 00:41:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e8337e5139e3b64ead997ec99c1c1358 SHA-1: 5ed24a190fca88e7055b8c3d633a4abfa808a859 SHA-256: cb11956a574747362e8ec110298e5c9c2bc5ac24b23548d8223e00fa2d94374f
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the document's structure and URL firings suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ggtraff.ru/strik?utm_term=hpi+savage+manual In PDF document text
    • https://kutemipemowu.weebly.com/uploads/1/3/4/8/134860595/390791.pdfIn PDF document text
    • https://nutiduvurenomal.weebly.com/uploads/1/3/4/6/134681926/kewufubo-jomuvur.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jifesu/85595987635.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/5997893423.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d33427a199023ab4f616/t/5fcba3f78dcc5603bef85ed8/1607181305522/how_to_draw_carlos_from_descendants_3.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/basic_instinct_2.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/windows_10_gratis_bagas.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/wejasasexinelisulevoj.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc10dd611f6a419848684c6/t/5fc40ea26457125654ba9a66/1606684323405/sony_str-de895_manual_portugues.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc18e08239b07229135edd6/t/5fc558bd9b1ed035388f247c/1606768832986/mr_gs_storage.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/android_studio_project_files_missing.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/cd_zeca_pagodinho_ser_humano.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5742b9698b02c7f3f64b4/t/5fd0f7c11058ec539c977bdc/1607530433969/tagarusajifobovidaditupoj.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_off0000c233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC233 4756 bytes
SHA-256: 609035098eb83f928c06b8d3aa7e1d594c142b6184c9b3e72826d8506d1c4019
font_01_sfnt_off0000d241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD241 11504 bytes
SHA-256: f7a3dc23dc994be824ddc6d2651df9b2c846e624ef1876f2abaa1452188f811c
font_02_sfnt_off0000f77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77C 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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