Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdb78795a89d39c2…

MALICIOUS

PDF

72.7 KB Created: 2021-02-20 17:57:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: b795407eb5b58db051fa6b5defa13d70 SHA-1: 2ce3d61f95b80fea82797f06a877b3daa1309d71 SHA-256: bdb78795a89d39c2221047c89b2dd414bdad386d4f22b6c3d44913def39c4c2c
154 Risk Score

Malware Insights

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

The PDF contains a link to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also flagged this PDF with high confidence. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest a phishing attempt designed to lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://crophysi.ru/aws?utm_term=inversor+yaskawa+j1000+manual+portugues In PDF document text
    • http://coloradocustomelectric.com/forsaken_world_talent_calculators32el.pdfIn PDF document text
    • https://cdn.sqhk.co/xugosovemi/fgMghMP/cake_decoration_with_dry_fruits.pdfIn PDF document text
    • http://vnds-super.space/nibepuxopiwt13d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378619/normal_5ff5c6ec21234.pdfIn PDF document text
    • http://ilkertr.shop/blufftitler_14_full_crackw77qk.pdfIn PDF document text
    • http://naturalik.fun/fourier_transform_of_aperiodic_signalcpc81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490920/normal_6027e798a8750.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467975/normal_602a8991600ba.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/jitimesolagun/38730593571.pdfIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/joe_s_crab_shack_nutrition_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/lotomu.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/denajufula.pdfIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/70250665978.pdfIn PDF document text
    • https://s3.amazonaws.com/mawesenasijoser/app_scanner_iphone.pdfIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/missguided_bandeau_fishtail_maxi_dress.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/the_good_doctor_korean_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/36490130321.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/duboxoregotokozu.pdfIn PDF document text
    • https://s3.amazonaws.com/jezobasit/cheri_cheri_lady_audio_song.pdfIn PDF document text
    • https://s3.amazonaws.com/sejakopa/6th_grade_math_multiple_choice_questions.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_off0000dd8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8E 5664 bytes
SHA-256: 41a192bd6e1144518fa24cd5d61fbfb5ad38f56244f999f976c538e44b80de8c
font_01_sfnt_off0000f0f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F2 10748 bytes
SHA-256: 414c2c1d4c917063ed340c22ae0f23e7dbb26d896bded141db5e349475f1a18e

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