Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ef4e2b08a9b94d1…

MALICIOUS

PDF

71.3 KB Created: 2020-12-19 18:10:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 1741cfc8bb42ad79b38fd07d5ec4f40e SHA-1: d73916fb582744a2715b2580e161731e7a58361a SHA-256: 8ef4e2b08a9b94d1718f066bb810363a8c9d408e5d3d938e946a1dcbe6bdd159
214 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of embedded links, many pointing to external PDF files hosted on link farms, suggesting an attempt to manipulate search engine results or distribute further malicious content. One critical heuristic specifically flagged it as a redirector link to known malicious infrastructure.

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
  • 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://cctraff.ru/strik?utm_term=beer+before+liquor+joke In PDF document text
    • https://refiraledekire.weebly.com/uploads/1/3/4/7/134715744/vajexajojugum.pdfIn PDF document text
    • https://pozitolize.weebly.com/uploads/1/3/4/3/134330731/rujuvemus.pdfIn PDF document text
    • https://wadonado.weebly.com/uploads/1/3/4/6/134677460/rasajimefaxogesilore.pdfIn PDF document text
    • https://fozijiruzixusap.weebly.com/uploads/1/3/4/3/134317533/xaduw.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/ribowexulo/rofifude.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbffb332bbd740658015355/t/5fc5d3d964571256540602ae/1606800349728/30942634226.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbfd2c30b6b03258f2f7c3b/t/5fc9dc32822fbd3263e0e73f/1607064626784/vamotipatopomowiz.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6763d68612547ed8438d4/t/5fcd6c73fe657040d5a5f225/1607298165783/pet_paradise_resort_jfk_houston_tx.pdfIn PDF document text
    • https://s3.amazonaws.com/getizar/dibowake.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf55c33570fb44d1f9a35f/1606374852772/kosatiwefi.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc64bc08ef7301f8b35bd0e/t/5fd04df75347e801a81cdede/1607486968549/hello_kitty_nail_salon_mod_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e30f3e5-d2c6-4ba4-b76f-2fbb68d1b2de/27154127538.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_off0000dc3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3E 4828 bytes
SHA-256: ba4407c8a30156585b420fc418b5c53ab30ac8a1dcbd49a88e6640bb1272956b
font_01_sfnt_off0000ecc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC8 10172 bytes
SHA-256: 032c12ec214f3467f8e0505067e0058f9d3eead5ce83d0222d744f42d4a16b52

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