Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfcab374fb73fddf…

MALICIOUS

PDF

81.4 KB Created: 2021-01-23 06:58:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 9778da8ff87e218034192b4c17487b6a SHA-1: efd81981b2f8746280e79eeacf44a00a90ba8920 SHA-256: cfcab374fb73fddff51c9b940299544e77dd636ed65f1fd514d41ba000344d81
96 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains an embedded URI pointing to 'trafffe.ru', which is a strong indicator of phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to 'things that start with da'. No scripts were extracted, but the presence of external URIs and the overall malicious verdict strongly suggest an attempt to redirect the user to a harmful 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://trafffe.ru/123?utm_term=things+that+start+with+da PDF link annotation
    • http://liwitavazij.iblogger.org/8393150683.pdfIn PDF document text
    • https://site-1178934.mozfiles.com/files/1178934/riwezuniwokujidujomari.pdfIn PDF document text
    • https://site-1168194.mozfiles.com/files/1168194/snes9x_ex_apk_1__5__37.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wofaketizezoja.epizy.com/81184984220.pdfIn PDF document text
    • http://nopuxawox.epizy.com/juneji.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/niwexuvas.pdfIn PDF document text
    • http://rugupodat.epizy.com/94460033328.pdfIn PDF document text
    • http://togipumenotu.epizy.com/barthes_from_work_to_text_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/befarekogol/caller_name_talker_app_free.pdfIn PDF document text
    • http://navasegekukuj.epizy.com/other_word_for_guided_tour.pdfIn PDF document text
    • https://s3.amazonaws.com/libeganot/golden_rules_of_accounting_file.pdfIn PDF document text
    • https://s3.amazonaws.com/bisiku/k_s_r_t_c_full_form.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/zaxizujabulabediz.pdfIn PDF document text
    • https://s3.amazonaws.com/xukirizugukugi/invoice_template_with_vat.pdfIn PDF document text
    • http://xepalufozakot.epizy.com/best_free_antivirus_for_pc_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/jokuzanegebosisulowerewo.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_off00010005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10005 5096 bytes
SHA-256: 208aa7b35aefe1f5fef8a11b9b4415e4d2c6824eedf881e9c57014afce39a0a3
font_01_sfnt_off00011167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11167 11496 bytes
SHA-256: 1242bc6d8ff78d31afc5d0c1383140433283f1ead36483d4831935bf176825be

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