Malicious PDF — malware analysis report

Static analysis result for SHA-256 a89a5878ff9478ee…

MALICIOUS

PDF

76.5 KB Created: 2021-01-20 14:44:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 72d75200f95b99ca466a81566875d71b SHA-1: 10814c4d8c9c536adccb53b5a2eba3da12034e26 SHA-256: a89a5878ff9478eec6ed99b0012da036dc39f7ede51e2d91933a3d53dddb810a
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate a strong likelihood of phishing or malware distribution. The ML classifier and ClamAV detection further support the malicious nature of the file. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffmen.ru/123?utm_term=ron+carter+league+city+service In PDF document text
    • https://site-1171487.mozfiles.com/files/1171487/mabivuza.pdfIn PDF document text
    • https://site-1178040.mozfiles.com/files/1178040/10068333492.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369330/normal_5fe0a5dbceb2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459936/normal_5fabac1904d38.pdfIn PDF document text
    • https://site-1178726.mozfiles.com/files/1178726/52431656571.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392664/normal_5f9524cb3d65f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462727/normal_5fcaa34912d2f.pdfIn PDF document text
    • https://dirusase.weebly.com/uploads/1/3/1/0/131070798/wurino.pdfIn PDF document text
    • https://site-1175937.mozfiles.com/files/1175937/galina_ustvolskaya_sheet_music.pdfIn PDF document text
    • https://tojoniwov.weebly.com/uploads/1/3/4/6/134602819/2112759.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/bifadiwuwileji/fb_messenger_android_app.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/meeting_acceptance_email_template.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/xetivoririvo.pdfIn PDF document text
    • https://s3.amazonaws.com/jodabiladezot/58826614793.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/bupeputupewavokatoreriro.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_off0000ebda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDA 5136 bytes
SHA-256: a989f6144f58a4474131a8c035b31fe81f65504132bc995517e5f8448e93fc2a
font_01_sfnt_off0000fd77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD77 11276 bytes
SHA-256: c36987d71c3fe1204903782d8a1180eb7dc9d5da29bd9b929209183866beb03d

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