Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d865421fee708ac…

MALICIOUS

PDF

73.1 KB Created: 2021-02-10 21:59:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6c8fa5fa45a1895e7c4b299405e9d534 SHA-1: 01108c210babcccc60caf4311827c9a4770311fd SHA-256: 9d865421fee708acc08484d1a1dea3e1d6db54b32da641574ab8252d088824cf
96 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains an embedded URI pointing to a URL that appears to be a lure, disguised as a search result for free sheet music. No scripts were extracted, but the presence of the malicious URL suggests an attempt to redirect the user to a phishing or malware distribution site.

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://jottigo.ru/wb?keyword=free%20sheet%20music%20for%20trumpet%20popular%20songs PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4411481/normal_5fc5cc78c6a78.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387241/normal_5fe0fe5a60e73.pdfIn PDF document text
    • http://talkme-news.info/genewuvugofe7utst.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416299/normal_5fc712396322a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407571/normal_5feaee6d8c92e.pdfIn PDF document text
    • http://prod-fruit.space/75511750136l6bx7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490264/normal_5fd1fd43accd3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371498/normal_5ff493f8bef92.pdfIn PDF document text
    • http://xtreme-sport.ru/965281432968oz98.pdfIn PDF document text
    • http://betmoy54.com/brick_mansions_full_movie_subtitle_indonesiaayb8i.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
    • http://rimuvuvipimube.epizy.com/cambridge_grammar_for_pet_book.pdfIn PDF document text
    • http://rikukevez.rf.gd/jalafejizuwibu.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/2727247104.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/antares_autotune_6_vst_free.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/perugetezifanemakam.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/vekolegakut.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_off0000d3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C2 5264 bytes
SHA-256: 9f142725afd1a9d9d669744b19bc7e876a890223f289650c706e28413804a765
font_01_sfnt_off0000e58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58A 10564 bytes
SHA-256: 07f552b8f54fd24cd1f3987756d4f50ccb39f0bb68dea7a2101351bdcbf4f0b0
font_02_sfnt_off00010963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10963 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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