Malicious PDF — malware analysis report

Static analysis result for SHA-256 e90a1a7b18e4885d…

MALICIOUS

PDF

72.9 KB Created: 2020-11-21 06:59:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 90fa5315d4268f679f511546359e48e6 SHA-1: c8019ab5fffaa9180f040a5f2df38f7be59bfaee SHA-256: e90a1a7b18e4885d719093f1091196793b190c3123954c68cc23823a7126f519
96 Risk Score

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 'trafficel.ru', which is likely used to deliver a secondary payload or conduct phishing. The document body, though heavily obfuscated, suggests a lure related to an 'idioms worksheet' for high school, aligning with social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=idioms+worksheet+pdf+high+school PDF link annotation
    • https://bakuwosir.weebly.com/uploads/1/3/0/8/130874569/zigupo_gutuximelek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444866/normal_5fb87c1fa16d7.pdfIn PDF document text
    • https://nifirasevaxo.weebly.com/uploads/1/3/4/7/134756957/muwidasikowu.pdfIn PDF document text
    • https://notapogixunimo.weebly.com/uploads/1/3/4/3/134363186/2882586.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417830/normal_5f9977e69a95a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/3efbca53-1a2a-4930-a661-e5bbfa121e9f/que_broca_usar_para_machuelo_de_1_4.pdfIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/problem_and_solution_essay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0cac81a-6627-41a5-bdb1-121025419c8a/gavabevarilefiwuneje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5737591-ed7e-4f85-a341-3491614ec48c/84331175580.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/muvolifojelipukus.pdfIn PDF document text
    • https://s3.amazonaws.com/nisoxow/niada_chart_of_accounts.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d10f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD10F 5132 bytes
SHA-256: 7bd87d269b3f8ba9d3d673652e34d1220d1b93a77bb8060887372ae5b25b0fa6
font_01_sfnt_off0000e2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A6 10768 bytes
SHA-256: 056c070f3deba740db83a84f5602b9eb066b48122500d30a244beb582f24b17b
font_02_sfnt_off000106fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FE 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e