Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffb27d58e67397a9…

MALICIOUS

PDF

76.0 KB Created: 2020-12-21 15:18:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: cae1ca8365c3ba7177f4482dea0eef7e SHA-1: 06e4a0cd5f13c5898a5709766bbbf7ae9c8084b5 SHA-256: ffb27d58e67397a97a989975392b94741e6179d56ab67fccb7665481abf962a7
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 likelihood of malicious intent. It contains an embedded URL pointing to 'trafffi.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains text that appears to be a lure related to 'Stack Overflow c++'. No scripts were extracted, but the presence of the malicious URL and the overall classification strongly suggest a phishing attempt.

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://trafffi.ru/strik?utm_term=stack+overflow+c%252B%252B PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409826/normal_5fc313c75e441.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421477/normal_5f9967a2d2b20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365606/normal_5f873d5f2bce1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381534/normal_5fafe7a533ea7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387826/normal_5f98b1b229e54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449775/normal_5fbad2fc2474e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369305/normal_5f8cee404ec1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427809/normal_5f9e0c7fa3af9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379363/normal_5f9c7a81de7d5.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/217feb0d-4e02-4caf-a641-b2f2171f55f0/91420150225.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f242287-c37f-40e5-b7ca-3d170156bab1/dinuriwumazad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb742389-a0ea-4176-be53-07e5c9b5dfc8/balanced_and_unbalanced_forces_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3a2c947-8396-4846-8443-69a11a024866/priere_st_benoit_contre_malchance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1835aad2-2ae9-49a9-991b-1242e3ec468b/25939927232.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9d8cbc6-c123-4c45-bc16-18448f75da6d/native_instruments_battery_4_catalina.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/331de35d-f2bf-4bb7-9906-efa5e2284b0a/degogozepama.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_off0000e9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C5 5016 bytes
SHA-256: 353f1ee586f44d56643cd05eea794a338e7f33a1d8242cb926b502d033d6398f
font_01_sfnt_off0000fb00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB00 11940 bytes
SHA-256: 9e67aee95ca0a7bbeae4fc0d6906e5f3a585c0a12f8e551ea64af5a3023379a1

Open this report in the interactive analyzer, or submit your own file for analysis.