Malicious PDF — malware analysis report

Static analysis result for SHA-256 57da3655814aaffb…

MALICIOUS

PDF

77.8 KB Created: 2021-02-19 11:56:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ea0732640ba32fbb2523428302475eda SHA-1: 0bf78da6d23662db4777606172b9f161b2c2e071 SHA-256: 57da3655814aaffb69bfdb4c03d2f1ca06539365832798091edbc6119dfa7cc0
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 flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, likely intended to host malicious content or redirect the user. The document body, though heavily obfuscated, suggests a lure related to a book title, aligning with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/strik?utm_term=a+documentary+history+of+the+united+states+expanded+and+tenth+updated+edition PDF link annotation
    • https://cdn.sqhk.co/jigavozef/eGidieP/93776968012.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417806/normal_5fe5d3e87740e.pdfIn PDF document text
    • http://in-step.shop/reading_comprehension_test_for_grade_5r0lpd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455659/normal_601615ba1a803.pdfIn PDF document text
    • http://about-igsupport.com/account_executive_resume_format_in_wordvun13.pdfIn PDF document text
    • http://my-favshopd.online/4682779859lel58.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366350/normal_5ff307146f202.pdfIn PDF document text
    • https://cdn.sqhk.co/lebapivi/v4kQIjh/63240822471.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xugigabitulu/zodez.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/volatility_cheat_sheet_2._3.pdfIn PDF document text
    • https://s3.amazonaws.com/nutanigonu/adventure_capitalist_mid_game_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/pewibim/fegifu.pdfIn PDF document text
    • https://s3.amazonaws.com/xiwevitox/esl_adverbial_clauses_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/totebekofumuwewumepirefiv.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_off0000e2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EB 5404 bytes
SHA-256: fcca32aca958ee2556914bbfb13181e1d9c35f1eb59686cb5e7e7a5737d85579
font_01_sfnt_off0000f524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF524 11220 bytes
SHA-256: 0744e552ce4f335a55ab6e99df93f4119c356a8fde5146e0b02ba278492f9f9c
font_02_sfnt_off00011b45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B45 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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