Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfe8edd7a7e3433d…

MALICIOUS

PDF

70.7 KB Created: 2021-01-15 06:44:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 3569456464b503c54e93ab685453a41f SHA-1: e757cc6559f6ffec77070a28684cb2e4ead19ce9 SHA-256: cfe8edd7a7e3433decc8e84ab111686981669118fc9467305f55d78f1a37977a
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, which is a strong indicator of a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support its malicious nature. The document body, though heavily obfuscated, contains text fragments that suggest a lure related to a 'writing test'.

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://traffset.ru/123?utm_term=what+is+the+act+writing+test+out+of PDF link annotation
    • https://cdn.sqhk.co/goluxewimabu/b9ievAW/robot_boy_cartoon_network_characters.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387052/normal_5f9c068b3b675.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407552/normal_5fbbc0a40960b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457570/normal_5feece4daac2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393752/normal_5f9002543dd4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369900/normal_5fda5e34c9031.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366005/normal_5ff7bc0dd1eeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375352/normal_5f8e596e93339.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530937/normal_5fc255dbe3678.pdfIn PDF document text
    • https://cdn.sqhk.co/vujagefamig/gdlvggf/xowopupaxobenejizibilibu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365638/normal_5ffe97e4b2703.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/wegetipirus.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/hello_tune_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/role_of_balanced_scorecard_in_performance_management.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/zafatava.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_off0000d945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD945 5216 bytes
SHA-256: a3e2a1745950e991bd469f42afaaebeab52eb9526d753bb33e3acc7e48adfc61
font_01_sfnt_off0000eb1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1D 10008 bytes
SHA-256: b2012049a534ee38bf9027dbcfbb7803704f7fb82aca441a4ae5118f385e6850