Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5443b95fc263685…

MALICIOUS

PDF

81.7 KB Created: 2021-03-01 14:33:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: acd6b7066efc9b67680ff28967d803c8 SHA-1: 2875fc2ce0d6c17f1d124288a19c423d7c183c59 SHA-256: e5443b95fc263685290f79295f544e56994aa6d2036cc944f72ff73f3398f964
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://crophysi.ru/strik?utm_term=ninja+professional+blender+1000+how+to+use'. This indicates an attempt to lure the user to a malicious site. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of malicious URLs is sufficient evidence for a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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/strik?utm_term=ninja+professional+blender+1000+how+to+use In PDF document text
    • http://wodekenizowa.getenjoyment.net/how_to_do_a_semiotic_analysis_of_a_film.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366040/normal_6028be2e333a4.pdfIn PDF document text
    • http://lapitubemexidi.mywebcommunity.org/33949743885.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450152/normal_5ff48ed1bdeef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448115/normal_5fe9720abc777.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/fadobirak/formation_of_trilaminar_germ_disc_animation.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/funniest_kid_test_answers_part_14.pdfIn PDF document text
    • http://zowipazivavi.epizy.com/xomukefotimomipagi.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/how_to_determine_valuable_marbles.pdfIn PDF document text
    • http://gatituz.rf.gd/nagoduditivi.pdfIn PDF document text
    • http://valupakukav.myartsonline.com/3600668665.pdfIn PDF document text
    • http://wevaxelim.rf.gd/how_to_set_casio_aw-80.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/nenukesepelese.pdfIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/antivirus_pro_for_android_free.pdfIn PDF document text
    • http://xunevonobi.epizy.com/visekekuvufalomujiketi.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/52378256303.pdfIn PDF document text
    • http://dowuvoduwitovos.atwebpages.com/density_practice_worksheet_answer_key.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_off000102e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E2 5600 bytes
SHA-256: 5cf82b2c418115f9e58ba789ffeda4d271d1ee3953c946f069e3a186fc22c235
font_01_sfnt_off000115fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FB 10448 bytes
SHA-256: b4c3223c2c4fd7e2447f8a58d043e03c672048d034b31733e060b3734dee4700

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