Malicious PDF — malware analysis report

Static analysis result for SHA-256 f21bf40c21c37229…

MALICIOUS

PDF

79.8 KB Created: 2021-03-08 23:49:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 4e7c5ed09c6a51b24dc08af0ef61945a SHA-1: 2b2fe1517920fff5208a7f54868a2a16da5d92c4 SHA-256: f21bf40c21c37229cb63fe2c4402a93147acc801ea1139bb01e1546cb9223e1d
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The file is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains language suggesting a 'valid tax invoice', aligning with the SE_INVOICE_LURE heuristic. The embedded URI points to a suspicious domain, likely serving as a phishing or malware distribution URL. While no scripts were explicitly extracted, the PDF structure and malicious classification suggest it exploits PDF vulnerabilities to execute malicious code or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://golowaki.ru/123?utm_term=valid+tax+invoice+template+south+africa PDF link annotation
    • http://damvglaz0.xyz/13708361149kcnxt.pdfIn PDF document text
    • http://nemosixumeki.mypressonline.com/ejemplos_de_molalidad_ejercicios_resueltos.pdfIn PDF document text
    • http://kunujunekedi.mygamesonline.org/97720410121.pdfIn PDF document text
    • http://pewadulojuba.mypressonline.com/cribbage_rules_flush_pegging.pdfIn PDF document text
    • http://negedibomul.sportsontheweb.net/why_isnt_my_vizio_sound_bar_turning_on.pdfIn PDF document text
    • http://copyrightproblem.com/the_measure_of_man_book1r22s.pdfIn PDF document text
    • http://tonedomopoja.scienceontheweb.net/harry_potter_quiz_which_character_are_you_beano.pdfIn PDF document text
    • http://tewatag.medianewsonline.com/toxifibizenusi.pdfIn PDF document text
    • http://app-3null.com/7690346208964lzu.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://s3.amazonaws.com/dinisemowoge/viber_app_for_iphone_5s_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wumodukubaru/lisomezizisewevelisa.pdfIn PDF document text
    • https://s3.amazonaws.com/gopifu/isaimini_hollywood_tamil_movies_2019.pdfIn PDF document text
    • https://afa032df-bfad-47da-a9c8-c79260182993.filesusr.com/ugd/6f9b04_14b7b2924797423797e8950364da3f68.pdf?index=trueIn PDF document text
    • http://bizedesaxifu.onlinewebshop.net/sexual_orientation_test.pdfIn PDF document text
    • https://09235f31-469a-4613-94fc-36d04c1f642a.filesusr.com/ugd/8b6407_1f8efd6beb644dd286e6f79ab97e1310.pdf?index=trueIn PDF document text
    • https://9c12218e-e157-4070-b33f-4467b3cb42bb.filesusr.com/ugd/0c60a0_ec89b4b0d38a4f08bf66cb6b615eab42.pdf?index=trueIn PDF document text
    • http://sefowolo.atwebpages.com/shure_blx_sm58_wireless_mic_system.pdfIn PDF document text
    • https://08c3cc13-1ce0-4add-927e-a3aed263473e.filesusr.com/ugd/ccf397_acfc43564c4c475aba62edc2b779c4f0.pdf?index=trueIn PDF document text
    • http://sulijugofogim.onlinewebshop.net/how_do_u_describe_a_rainbow.pdfIn PDF document text
    • http://fuluxewamotate.atwebpages.com/ragulomumetejobip.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/48632461513.pdfIn PDF document text
    • http://jitawidavez.atwebpages.com/noruzibotikekinifowi.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_off0000ec34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC34 5368 bytes
SHA-256: 6f652aed1bbd061c3720e8e94a64c472597211b2f80d30371451db5a7ccf3fe3
font_01_sfnt_off0000fe4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4F 10876 bytes
SHA-256: f96ba812ed1d268d162c4c4b4059dd688b62100e4e25e81cdd63b4cef0dfc565
font_02_sfnt_off0001234c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234C 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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