Malicious PDF — malware analysis report

Static analysis result for SHA-256 21f887eb8ee05a67…

MALICIOUS

PDF

73.5 KB Created: 2021-02-26 01:51:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3962aa881819462c32f31b836d501162 SHA-1: 9bc8c212c0e888ea5ed4722f35083009415e59ec SHA-256: 21f887eb8ee05a67235ab8267e01482e5a46336b8ebe1f25bd0a3457a121b024
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, identified by ClamAV as Pdf.Phishing.Trojan. The ML classifier also flagged this PDF with high confidence. While no scripts were explicitly extracted, the presence of an external URI and the nature of the ClamAV detection suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://baarspo.ru/strik?utm_term=joke+book+omori PDF link annotation
    • http://boldly-grow.com/english_reading_book_for_beginnersxbrbk.pdfIn PDF document text
    • http://therarbooks.com/5218630984ozo53.pdfIn PDF document text
    • http://vuzitofakomuj.22web.org/5131736725.pdfIn PDF document text
    • http://zavutodoga.iblogger.org/34642526903.pdfIn PDF document text
    • http://kenujuzuba.22web.org/how_much_do_wheelchair_lifts_cost.pdfIn PDF document text
    • http://morpeoplelife.ru/heart_vector_free_freepikpn2bq.pdfIn PDF document text
    • http://bixuvetojotenes.22web.org/adobe_photoshop_cs6_extended_trial_free.pdfIn PDF document text
    • http://ighelperscenter.com/how_many_quarts_does_a_chevy_transmission_take9xh0z.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/pajeriramal/yahoo_email_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/luropiw/zemufu.pdfIn PDF document text
    • http://vaxasevon.epizy.com/gajididila.pdfIn PDF document text
    • http://nejovafejasujob.rf.gd/83866967479.pdfIn PDF document text
    • http://risewoririti.epizy.com/2_digit_subtraction_worksheets_with_regrouping.pdfIn PDF document text
    • https://s3.amazonaws.com/kafises/goliath_must_fall_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/20539241823.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_off0000dadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADF 3156 bytes
SHA-256: 7340792cac403814425c39ff84fb77cf3c266c8e2cfb652305b73dc2212ee7e4
font_01_sfnt_off0000e628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE628 4604 bytes
SHA-256: ff26e83099b70f3331f09640d037e1aae185722e0fe6dd2ad7f4980173dac5b4
font_02_sfnt_off0000f5c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C5 10364 bytes
SHA-256: 6abb85c508bd0896cf09f5dcc13f8eba82e77b31d212ced24d4b363294da21b1

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