Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8a03191cd150aa8…

MALICIOUS

PDF

74.0 KB Created: 2021-01-04 10:01:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 5de0e1b4de017999f62636b937514c19 SHA-1: 9596974a971eedd7d960a641a3b132161d363cc6 SHA-256: e8a03191cd150aa86519cd8e87e6436249d65ffda8f27e73a5b7b24e3cdea7a8
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high probability of malicious intent. The embedded URL, 'https://trafficel.ru/aws?utm_term=account+balance+check+app', suggests a phishing lure related to account balance checks. Although no scripts were explicitly extracted, the PDF structure and the presence of external URIs are common in phishing documents designed to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://trafficel.ru/aws?utm_term=account+balance+check+app PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368489/normal_5f891051bb757.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392667/normal_5fb56f00f1ca3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365545/normal_5f96c89ee3661.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384483/normal_5fbc5757b0185.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449001/normal_5faf37619af34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380527/normal_5fe8cdc963bd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450257/normal_5fb598429934c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465012/normal_5fdab1d4a6dc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408981/normal_5f95bb50f2a31.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484821/normal_5fec01406e837.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479435/normal_5fedea42b7ae7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482880/normal_5fc3d85e6b758.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/980a9e5b-5b24-498b-b086-114c810788c0/78252451841.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f3fae22-c59c-48a1-9a94-9d2e2b4faa1a/mizopivuxenenom.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_off0000e548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE548 4940 bytes
SHA-256: 8212ae43b85e24d5c06f5df56f8f2d1c33bc20c11f3b3d487323209bba990b05
font_01_sfnt_off0000f610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF610 11100 bytes
SHA-256: 35ba1990c8b85a40df50d99b4b8dcf3a687271c0182060f8cf49cdd37a3a7abc

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