Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf24a38f1d37833c…

MALICIOUS

PDF

85.4 KB Created: 2021-05-05 12:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 469bc7f7e9c9248700cec1c1ca419809 SHA-1: 423ad2ae56b3e45e83fa81cd9a9f98cbf34ce8a5 SHA-256: bf24a38f1d37833c929b70c435c66b4fa9f07181cc1cd9047bd6132dff342940
96 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of an external URI pointing to 'zajinet.ru' suggests an attempt to redirect the user to a potentially harmful site. While no scripts were explicitly extracted, the PDF structure and the embedded URI are strong indicators of a phishing or malware distribution attempt, aligning with the 'Spearphishing Attachment' technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/strik?utm_term=50th+law+of+power+50+cent PDF link annotation
    • http://fevevafo.medianewsonline.com/66534307359.pdfIn PDF document text
    • http://mopewogubit.getenjoyment.net/bc547_bipolar_junction_transistor.pdfIn PDF document text
    • http://worozoxiw.sportsontheweb.net/how_long_it_takes_to_study_for_usmle_step_1.pdfIn PDF document text
    • http://siwikilapezufi.iblogger.org/22233499238.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/tokatefozude/how_many_cm2_in_a_mm2.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/apple_iphone_5c_32gb_price_in_bangladesh.pdfIn PDF document text
    • http://dokused.epizy.com/5775000481.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/51233608025.pdfIn PDF document text
    • http://luvafavuma.rf.gd/liketasulepawewabuvuganad.pdfIn PDF document text
    • https://s3.amazonaws.com/sewamos/85931205183.pdfIn PDF document text
    • https://s3.amazonaws.com/lusegokaves/67014583789.pdfIn PDF document text
    • https://s3.amazonaws.com/lejivugeleguwod/6874388493.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/wuvurosewu.pdfIn PDF document text
    • https://s3.amazonaws.com/winumigutam/75000158202.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/jowuvet.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/emil_and_the_detectives_book_review.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/text_to_image_translation_gan.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/atari_flashback_7_add_games.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/naniwepu.pdfIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/41600499083.pdfIn PDF document text
    • https://s3.amazonaws.com/jusagi/husqvarna_450e_chainsaw_case.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_off00010dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEC 5188 bytes
SHA-256: 03667630b4f6fc18341a1b00a17bddde521b5971a56ed9db65ea1a8caa760d44
font_01_sfnt_off00011fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA8 12128 bytes
SHA-256: 406f6849d4454d1c2c1dffecf65e3d4a7638bf32c9c2c4b599fc61fa43dc69b9

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