Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd9550c036f3000f…

MALICIOUS

PDF

69.0 KB Created: 2021-02-22 00:53:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6542b0e167f4172553ca0270874fac3e SHA-1: 526f29b64ef6075aa8e653d517dcde7dc919a1f1 SHA-256: cd9550c036f3000f87db7447f72040bcd3bf504bb5a52ab8d9658fef6359332a
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users to potentially harmful websites. ClamAV detection and ML classification strongly indicate this is a phishing or malware distribution attempt. The embedded URLs are likely used to host malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/aws?utm_term=impulso+revista+oficial+del+colegio+de+profesionales+de+la+enfermeria+de+puerto+rico PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4489409/normal_6000c6d05bfae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459177/normal_5fe58bdb64bd7.pdfIn PDF document text
    • https://cdn.sqhk.co/bezakebijuk/akirpbt/dadetetetibozevuvab.pdfIn PDF document text
    • http://klokisik.space/hotel_booking_form_ielts_listening_answersgabav.pdfIn PDF document text
    • https://cdn.sqhk.co/datimemovuko/Ajagdge/legozenuxuzariw.pdfIn PDF document text
    • https://cdn.sqhk.co/bisuligiga/nEhgIhc/skyblock_dragon_horn.pdfIn PDF document text
    • https://nakeripa.weebly.com/uploads/1/3/2/8/132814262/xijuboran_papezudamejux_dobademekavukeb.pdfIn PDF document text
    • http://fortuneocredit.com/11743623358i6dyy.pdfIn PDF document text
    • https://dosaremuxabibi.weebly.com/uploads/1/3/0/7/130739916/biwekoso_danojuxologubo_jowuj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530151/normal_6009aa71d7d14.pdfIn PDF document text
    • https://cdn.sqhk.co/zarepowake/4pmhgif/99924219550.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/mexijegedakol/all_educake_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/concept_paper_template_word.pdfIn PDF document text
    • https://s3.amazonaws.com/piwupevivotixi/lockout_tagout_procedure_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/how_to_automate_android_app_testing.pdfIn PDF document text
    • https://s3.amazonaws.com/rodakarugupoko/android_bssid_connect.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_off0000cf97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF97 5472 bytes
SHA-256: 4b34ee11006ce928e9714346bdda606e908a4523cbcc48644fcf791c0f288b09
font_01_sfnt_off0000e223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE223 10952 bytes
SHA-256: 1e28b99e9555b84074e445132a7bd1089f815f5ef3d3086c89373efc371e00df

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