Malicious PDF — malware analysis report

Static analysis result for SHA-256 39b435d07cecef54…

MALICIOUS

PDF

80.0 KB Created: 2021-05-18 20:41:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8c7d498fb92a1e0f81157709a926fb3b SHA-1: cd8f921d839b92e5a2e452565005e128f645d1b0 SHA-256: 39b435d07cecef54a5b650298b56c2345cf79638eb8eafd03e6d49316942872f
96 Risk Score
Tags
free-cdn-ebook-manual-lure

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 identified as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, likely intended to host a malicious payload or redirect the user to a phishing site. The document body, though heavily obfuscated, suggests a lure related to educational materials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jottigo.ru/strik?utm_term=ejercicios+resueltos+de+dinamica+1o+bachillerato+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418972/normal_600a53197b26b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448724/normal_60317e13d23fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488574/normal_6012432e6f452.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423195/normal_6046c2bde3783.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413122/normal_603f013061ec4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486054/normal_5ffa447416c5f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481275/normal_5ff2ba8bd8947.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495525/normal_60108e4362b5b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406202/normal_5fee386944640.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445737/normal_6046406e306ba.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/rizezobabub/nusovabumupedoxa.pdfIn PDF document text
    • http://suvowafavij.epizy.com/business_english_book_1.pdfIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/kraft_paper_sheets_michaels.pdfIn PDF document text
    • http://gijabakupukuj.rf.gd/christmas_songs_sheet_music_for_alto_sax.pdfIn PDF document text
    • http://getetir.epizy.com/gumuf.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/9590665841.pdfIn PDF document text
    • https://s3.amazonaws.com/wozowuledij/descargar_biblia_de_estudio_arcoiris.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/veterans_day_worksheets_for_5th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/wot_jagdpanzer_4_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/20633234003.pdfIn PDF document text
    • http://zinipaxafuzonik.rf.gd/juribudewexip.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/episode_interactive_guidelines.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_off0000ec69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC69 5620 bytes
SHA-256: b87345f82990b59884ec95993c24f24d76745bbb74e4891529e9a42860b639cc
font_01_sfnt_off0000ff58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF58 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off000107e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E5 12476 bytes
SHA-256: bf14b57b2c31f66c49c5bb546716c978019576590272f53ae88102add839b78c

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