Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad89567bccf0f57e…

MALICIOUS

PDF

75.1 KB Created: 2021-02-16 09:05:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: e70d5dd833badf9dc32dc9090af29da7 SHA-1: 5230cea64442bbbef57dbef3cc8db5e17e1d1ef7 SHA-256: ad89567bccf0f57e4d94e93193b862b7e1c9b20c469f040f9aad547387d0ac3d
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/strik'. This URL is presented in the context of search results for a product, indicating a phishing or scam attempt. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URL is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://yafferge.ru/strik?utm_term=black+and+decker+bread+maker+french+bread In PDF document text
    • http://dudodew.iblogger.org/rpf_ancillary_answer_key.pdfIn PDF document text
    • https://cdn.sqhk.co/vejurumilef/ghahaM4/9826715641.pdfIn PDF document text
    • https://cdn.sqhk.co/lukisebeka/jhhjb8a/51082496265.pdfIn PDF document text
    • https://cdn.sqhk.co/pasivuzuke/Hgcujb4/armello_gameplay_trailer.pdfIn PDF document text
    • https://cdn.sqhk.co/rabuzopat/3jiUjiR/zepapujopeda.pdfIn PDF document text
    • https://cdn.sqhk.co/miropefaneka/MOqhfee/elements_of_art_shape.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bajanasik.rf.gd/gamukoledavi.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawe/naruto_shippuden_mod_by_ricky_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/menavilizuxopipenopo.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/gajuseguxedelakotiwu.pdfIn PDF document text
    • https://s3.amazonaws.com/retisovojor/jiwadajisezukotapetegune.pdfIn PDF document text
    • https://s3.amazonaws.com/mulerux/indonesia_visa_application_form_for_bangladeshi.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_off0000e798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE798 5336 bytes
SHA-256: 935361ae1cc24cf4ecefcb1df4b31da280f02532d9ba8a167e08e51ba8950a54
font_01_sfnt_off0000f996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF996 11120 bytes
SHA-256: 66d09e469e3bd413103872a51951a1cbccbe0a21b918f8b9f1036c81959a1df0

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