Malicious PDF — malware analysis report

Static analysis result for SHA-256 f24f6aff137ec8c7…

MALICIOUS

PDF

77.7 KB Created: 2021-04-07 01:35:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 40efd81a489f2c2ff44d00f91a2c72f6 SHA-1: 5ab7800a11e584bd0ffe140cbb8dce7033b752f7 SHA-256: f24f6aff137ec8c71d9392629db5a9abd6dbefe707724e5a3e6503661cee43c8
96 Risk Score
Tags
free-cdn-ebook-manual-lure

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 embedded URLs, particularly 'https://zajinet.ru/123?utm_term=valve+anti+cheat+cs+go', suggests a phishing or social engineering lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to trick users into downloading further malicious content.

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://zajinet.ru/123?utm_term=valve+anti+cheat+cs+go PDF link annotation
    • http://susurrus.space/network_systems_administrator_job_descriptionkuoqw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384301/normal_5fe2b46c7288b.pdfIn PDF document text
    • https://cdn.sqhk.co/saguregifu/gOXgid4/one_block_skyblock_map_1._16._2.pdfIn PDF document text
    • http://zawoxilejaku.66ghz.com/ictal_event_or_interictal_epileptiform_discharges.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417643/normal_6029a7b5cc4a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366625/normal_6033810e6171f.pdfIn PDF document text
    • http://furniture21.online/babunupageverawije4ao.pdfIn PDF document text
    • http://stixlife.info/aptitude_test_answers4nykw.pdfIn PDF document text
    • http://flowerport.market/synonym_worksheets_4th_grade_printablew49w0.pdfIn PDF document text
    • https://cdn.sqhk.co/korulifesewa/whhiceK/red_rose_black_tea_review.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mugosovexu.epizy.com/asus_x510ur-_bq292t_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tafogusegabomu/addition_worksheets_no_carry_over.pdfIn PDF document text
    • https://s3.amazonaws.com/dazemi/63097585819.pdfIn PDF document text
    • http://bodotekufuw.rf.gd/ict_trends_in_education.pdfIn PDF document text
    • http://duzatip.rf.gd/bank_clerk_exam_syllabus_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/congruence_of_triangle_class_7_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/73122925998.pdfIn PDF document text
    • https://s3.amazonaws.com/kevava/33075274808.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagobomap/metric_conversion_worksheet_and_answer_key.pdfIn PDF document text
    • http://mageparojepu.epizy.com/misukamo.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/dremel_4000_vs_4300_differenze.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_off0000f1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CE 4988 bytes
SHA-256: ff6d8c3994d75703eeb2925cf9180e3dbdb166d0191324f3d10cc50453687a8d
font_01_sfnt_off000102d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D1 11304 bytes
SHA-256: b0cf496a3b4f17d463052087ae6e9733f5dd63c727c2efc8a72443c6efa8b1bb

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