Malicious PDF — malware analysis report

Static analysis result for SHA-256 0783773516e74032…

MALICIOUS

PDF

93.0 KB Created: 2021-01-04 01:11:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 65af5fc07ed606611b4bd687807dfec3 SHA-1: e95457e3989c30a08a8d53a0a50ae4afed14e214 SHA-256: 0783773516e74032d2bf1daaa137001acd38d0f584e7fe08c0e38aec29e72870
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, which is a strong indicator of a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest it's designed to redirect users to a malicious site, likely for credential harvesting or further malware delivery.

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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffe.ru/123?utm_term=nustep+trs+4000 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454973/normal_5fe9d73f311e5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496602/normal_5feb616580d18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453326/normal_5fe6877d084cf.pdfIn PDF document text
    • https://cdn.sqhk.co/fujalapevame/jgg7jcL/auto_answer_whatsapp_iphone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384316/normal_5f95736a5138a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372702/normal_5f8a6dbce133f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470521/normal_5fc2de568f300.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/1e76aea9-ccc9-437d-aabc-1721a0dea0c6/78351272349.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc4da161-b087-473e-9218-8d059d00e87c/52109118141.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/music_sheet_symbols_piano_reading.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/60810857697.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/gotemogit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9913d13a-83f9-4515-a80f-db1e526fc6c0/mefibonuda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71bf438f-c306-4e39-893c-382752d4810f/season_20_south_park.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_off000122d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D5 4768 bytes
SHA-256: 8df8d6785ecfbf66040a7a8dcc59d7b2c3029045e183ed308929c3bf8fce9b9d
font_01_sfnt_off0001332d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1332D 16860 bytes
SHA-256: baf9465cf65630528a7c1d9efa29f4b35b21325f0f7777d21df3015958bfb675