Malicious PDF — malware analysis report

Static analysis result for SHA-256 aff88f01175e0c44…

MALICIOUS

PDF

69.5 KB Created: 2020-12-22 22:02:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 2911fa40e49ba410a08edfb13dbc43d0 SHA-1: b39a23935cbfeef696311090fd60bfb7acea8dff SHA-256: aff88f01175e0c44d1c249c32983d5aaba7a0948b1c53e3ff3c00e0a5234cb61
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector infrastructure, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the presence of a malicious URL within the document body suggests an attempt to redirect the user to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • 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.
  • 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/aws?utm_term=antivirus+microsoft+security+essentials+windows+7 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4420743/normal_5f96f1b4a431d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366008/normal_5f8710f5d6ba9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411915/normal_5fad80a2931d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414166/normal_5f9edc85d6208.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417528/normal_5fd96916cb57f.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/5fc1b8bec30a162e0c583fa8/t/5fd1046171a9014fed8fd81d/1607533674668/rosol.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0abc6bda9c57a97bd16fd/t/5fc2605d3f75b16643211b6c/1606574174982/namok.pdfIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/tidofogupomegukimodus.pdfIn PDF document text
    • https://s3.amazonaws.com/libeganot/95564004623.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcfdf1ef3361272aec5a8a/1606221298558/historia_de_futbol_soccer.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_off0000d353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD353 5492 bytes
SHA-256: ee81f611249f7874033f6650b205b6fd398bd5dc7645c8a801233ceef44ea3b4
font_01_sfnt_off0000e610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE610 10260 bytes
SHA-256: e519402246463f4e43131a62cef6698f4da67841ef7394e0637582ff903c7a24