Malicious PDF — malware analysis report

Static analysis result for SHA-256 57fa72a5a834517c…

MALICIOUS

PDF

87.8 KB Created: 2021-04-01 20:13:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: c5fae0f10d7684e4f3305031a7a007d4 SHA-1: 11eb4acfda167980efda5061156ef6af59e0bcb2 SHA-256: 57fa72a5a834517c22f7ddc92d142bc24a1295d1edc9ed389304a7035ac38f82
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, 'kuzutuzo.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to academic research to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/award?keyword=early+effect+in+transistors+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486350/normal_601c71a129d09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444622/normal_6029a7b632963.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493867/normal_6031442c84486.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393901/normal_6030d4d512d02.pdfIn PDF document text
    • https://cdn.sqhk.co/woravejafeto/O5RmjdW/nj_workers_compensation_adjournment_request_form.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490123/normal_601bb17f386ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424951/normal_603a0ed6f18d2.pdfIn PDF document text
    • https://cdn.sqhk.co/gezefesete/HjfheyW/bifevuxewuzalasejeje.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496853/normal_5fe2854717d43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381759/normal_60602a740339a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368237/normal_5ff7a092f1e76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428342/normal_6015da1b202dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499285/normal_6062f7e4a5b0f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417834/normal_5fe3095b3b0c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453129/normal_6036a140da946.pdfIn PDF document text
    • https://cdn.sqhk.co/kagumuzom/bhetjfB/shopping_list_voice_input_pro.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/xilasisefi/the_raven_remastered.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b2b2e62-47f1-40d6-81c4-cfa8b33afa53/what_are_the_qualities_of_christian_leadership.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/14645923913.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb6a8410-e82a-4c53-b5b9-c4a6cdec0a00/mezinirolovumomudod.pdfIn PDF document text
    • https://s3.amazonaws.com/xoferuzu/biology_chapter_18_classification_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/minegikukovel/84572122525.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_off000116ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116ED 5208 bytes
SHA-256: ac457f03e7b4b3c828dee95b0ff1d11f15dd061094d27127de576e580496548d
font_01_sfnt_off000128c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C3 12108 bytes
SHA-256: ad267c008a39cdb55b7b0716a424812cc7c9fa21f6a294c5b2c9ea099b88cb2a

Open this report in the interactive analyzer, or submit your own file for analysis.