Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4730c6cffbe2c11…

MALICIOUS

PDF

63.0 KB Created: 2020-12-14 22:20:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 23ccb767634c437b43715b92d0c5a0b3 SHA-1: 0f10f262b3fc76bfb9cd4a0862a71cadab35b4f5 SHA-256: a4730c6cffbe2c1131e311280bcf1c8c0b1539d7ab05036ceee98383a96214df
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 at least one 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 PDF structure itself is designed to lead users to potentially harmful external 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://traffking.ru/aws?utm_term=arkanoid+snes+rom In PDF document text
    • https://javezevefumutew.weebly.com/uploads/1/3/2/7/132740470/beb4b1b91e.pdfIn PDF document text
    • https://bileravufal.weebly.com/uploads/1/3/4/7/134749654/1e4d590b787.pdfIn PDF document text
    • https://dedaruxije.weebly.com/uploads/1/3/4/4/134455514/2260008.pdfIn PDF document text
    • https://varusimutajol.weebly.com/uploads/1/3/4/5/134502614/f702f74f49.pdfIn PDF document text
    • https://gekawemugib.weebly.com/uploads/1/3/4/6/134623466/komax.pdfIn 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/5fc0879da3bf4b14aba759f2/t/5fc1001308845d0924adcd30/1606483988416/lasabapuxilonadujujixup.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf549b08845d0924814e54/1606374555708/backpage_mcallen_tx.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/email_formal_espaol_saludo.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc33129affbf90a66f953cc/t/5fca3e886a94db17e49c0908/1607089800034/funny_words_that_start_with_the_letter_r.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7b0c8c43b1711988c2de8/t/5fd1669a071bbc68801d1300/1607558810652/92593715929.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/bluestacks_whatsapp_for_pc.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_off0000bac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC4 4992 bytes
SHA-256: 3d8fe97738e1e1003cf22f1adaa5397c22f5bf9ecdf7903d83d41463a3705d25
font_01_sfnt_off0000cbaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBAA 10720 bytes
SHA-256: 40b92f55669c3eec2544e50fae1ce4f60abdfed309292a8d14331c18dc03c70f

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