Malicious PDF — malware analysis report

Static analysis result for SHA-256 425c80f31fec7496…

MALICIOUS

PDF

76.5 KB Created: 2021-05-03 14:36:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c93b1f6f122efbd8ecc4f4b0e8ff6175 SHA-1: 6bafb4d1daf93e63f892b9517847958230a7cf0a SHA-256: 425c80f31fec7496fad78371773a67a9ab78defdae34cfd3f1340e4f9a319def
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, vilenefex.ru, which is highly indicative of malicious intent. The ML classifier and ClamAV detection strongly support this assessment. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest it's designed to redirect users to a malicious site, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/strik?utm_term=what+was+the+pinckney+treaty+quizlet
    • http://fakixigulidol.mywebcommunity.org/liweromojawibudosakabaxul.pdf
    • http://setokanekema.mygamesonline.org/78635308964.pdf
    • http://xesapuwax.mywebcommunity.org/virudi.pdf
    • https://bizitodavil.weebly.com/uploads/1/3/4/3/134321392/xitopez.pdf
    • https://basupetuwesaf.weebly.com/uploads/1/3/0/7/130739706/xajavasike_kanomin_muwixoponuxuj_ruwewekuxa.pdf
    • https://zewakifu.weebly.com/uploads/1/3/0/7/130740590/pebikivu.pdf
    • http://xesapuwax.mywebcommunity.org/4811895789.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1cdd1dcb-54a5-4750-95ad-c4cce9a68cd1.filesusr.com/ugd/1e32c2_c919c85d27a94354bca00120692eb7d0.pdf?index=true
    • https://s3.amazonaws.com/varolexexus/cmfas_m8.pdf
    • https://944bcc21-9f45-42c2-9889-8cf837fa5d1c.filesusr.com/ugd/50f869_363833732f02452693b329a08b73ffc4.pdf?index=true
    • http://wolobugoxew.myartsonline.com/best_buy_rode_videomic_go.pdf
    • https://s3.amazonaws.com/kewakuko/android_appcompatactivity_fragment.pdf
    • http://jukasuxoseki.atwebpages.com/57362964131.pdf
    • http://bumejefivoxigo.myartsonline.com/asynchronous_counter.pdf
    • http://lobopekogolo.onlinewebshop.net/stairway_to_heaven_korean_drama_park_shin_hye.pdf
    • https://f89b8795-a90f-4359-81e0-6309601a98d9.filesusr.com/ugd/8e7730_662931e9304449eb9ec37c36414f5d26.pdf?index=true
    • https://s3.amazonaws.com/xumakomowi/menstrual_cycle_phases_and_hormones_worksheet.pdf
    • https://c3e780e1-a1ee-422e-80b3-2bf79490ff1e.filesusr.com/ugd/dc7b26_0a7e24e14d324447b002d94e9eb7675b.pdf?index=true
    • http://bemabam.myartsonline.com/wategikoput.pdf
    • http://wufagezigedo.onlinewebshop.net/najukevo.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_off0000ee39.bin
a88775ac146f3a2090dc1082d3b3a85a648103fd4b8f251352d01cdf2cc24ead
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE39 5468 bytes
font_01_sfnt_off000100f7.bin
6ed9bfc8f1fedc0bfa9e7cd3e6605e136f1f34154fe50ce4cd26849d1dc87b69
pdf-font-stream PDF embedded font (sfnt) at offset 0x100F7 10512 bytes