Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a7adc510a15f0d…

MALICIOUS

PDF

74.2 KB Created: 2020-11-13 23:07:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a2cabf072be566b55508f980a2ea791 SHA-1: cf5e68f096b2ecf1fe629a2c90a6a818ebbea161 SHA-256: c1a7adc510a15f0d10b920bbff1dc996a3a393b804493620fa82fe977d02d4fc
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URL that likely leads to a phishing or malware distribution site. The document body, though heavily obfuscated, contains text that appears to be a lure related to 'Aceleracionismo caja negra'. No scripts were extracted, but the presence of an external URI and the ML/ClamAV detections strongly suggest a phishing or credential harvesting 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://traffset.ru/strik?utm_term=aceleracionismo+caja+negra
    • https://cdn-cms.f-static.net/uploads/4382961/normal_5f8fb319ce44e.pdf
    • https://cdn-cms.f-static.net/uploads/4413980/normal_5f9780af2018d.pdf
    • https://cdn-cms.f-static.net/uploads/4369671/normal_5fad8bfb1a864.pdf
    • https://cdn-cms.f-static.net/uploads/4379719/normal_5f90f7a998722.pdf
    • https://cdn-cms.f-static.net/uploads/4388279/normal_5f95e0aaed6e3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/61b796a5-6596-4fea-b50d-836d01e542b5/gerazogufegom.pdf
    • https://s3.amazonaws.com/nokiva/babylon_the_great_has_fallen_kjv.pdf
    • https://s3.amazonaws.com/xunilukegez/94798763089.pdf
    • https://uploads.strikinglycdn.com/files/5844fb71-bb2f-4486-bb17-6528dd8aed46/bevoxi.pdf
    • https://s3.amazonaws.com/zetare/40457067422.pdf
    • https://uploads.strikinglycdn.com/files/24b6a3c6-4134-4fb5-bb42-a7e29407ff42/fagit.pdf
    • https://uploads.strikinglycdn.com/files/87ee1cfc-ddf9-4601-bcfd-235d48a83731/8137589575.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e408.bin
f28b30fec3940d961d702eb4e6132a7974d068c7b876fd90abfb6afa4298484a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE408 5184 bytes
font_01_sfnt_off0000f59b.bin
e5383f170a8cff8167c63d713aea77f35efb156ca6b6759d776e8f738f369e53		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF59B 11668 bytes

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