Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa91490d8706612e…

MALICIOUS

PDF

69.7 KB Created: 2021-01-06 16:02:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 386895d7c397db06975b80999d28510f SHA-1: a9e48fbd16b2c9cd3c0664ac77637274b11251f2 SHA-256: aa91490d8706612eadb72f024208785dc02d810d3d3c042e0e86ee4ccdcbbc4d
154 Risk Score

Malware Insights

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

The PDF contains embedded links pointing to known malicious redirector infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The ML classifier also strongly flagged this PDF as malicious. The primary function appears to be directing users to potentially harmful external content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://cctraff.ru/aws?utm_term=carencro+middle+school+uniforms In PDF document text
    • https://cdn.sqhk.co/goluxewimabu/KzFJVgd/55511986187.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425227/normal_5f9de86c5cc9e.pdfIn PDF document text
    • https://cdn.sqhk.co/lotivadafe/7jdo2sy/zilowukurexexibefumare.pdfIn PDF document text
    • https://nisuwifa.weebly.com/uploads/1/3/1/4/131453943/jisilexep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375351/normal_5fd2e9dd982b6.pdfIn PDF document text
    • https://jozisilefetaj.weebly.com/uploads/1/3/4/4/134476246/20ce3be5d4db21f.pdfIn PDF document text
    • https://cdn.sqhk.co/kalijada/LZgfjcD/mewe_app_reviews.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403952/normal_5fee1eca56053.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/39f8a8e3-aaa1-4ee6-b9ce-a8977187d445/74711676270.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97e812ef-eaa5-4253-8199-4c9ffc1844cd/23404076486.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9727a35a-6f37-4e53-8ff0-692057b9747f/woodbridge_high_school_irvine_bell_schedule.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_off0000d5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A9 5168 bytes
SHA-256: 69054919dd134948c8552637f286fde842369e56ea842b246d2f029feae35935
font_01_sfnt_off0000e70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70A 10240 bytes
SHA-256: 913dea23f5a88daf32d2b86da4b751646fe70a83d8ddf7d8934173d7cff8d434