Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4b3e91f48125381…

MALICIOUS

PDF

70.0 KB Created: 2021-02-19 07:40:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: bc47fd1e4993dc85b8d4d78cb1300301 SHA-1: 8f3eb3c6465659b6ed865e45eabebfbeb18dc760 SHA-256: e4b3e91f481253815d049150b3c864b4514c8aec53d436b55380f49b0dcd2ccc
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external websites designed to host further malicious content. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that at least one of these links directs to known malicious infrastructure. The ML classifier and ClamAV detection strongly support the malicious nature of this file. The document body, though heavily obfuscated, appears to be a lure related to Apple Watch ECG functionality.

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
  • 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.
  • 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.
  • 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=how+do+i+use+ecg+on+apple+watch+3 In PDF document text
    • https://japilulijerimu.weebly.com/uploads/1/3/0/7/130738614/629683f998.pdfIn PDF document text
    • http://scarcebook.com/zitefujotazomebawad5jinv.pdfIn PDF document text
    • http://cardioactiveufficiale.site/javascript_tutorial_for_beginners_with_examplessjdi1.pdfIn PDF document text
    • http://teachersaid.fun/68867592964imo35.pdfIn PDF document text
    • http://timecodes.net/89195667200rhhuo.pdfIn PDF document text
    • http://avit0.cc/how_to_replace_blades_on_husqvarna_riding_mowerlfhon.pdfIn PDF document text
    • http://aicberg.net/74511745088uo1hz.pdfIn PDF document text
    • http://5-euro.info/45977914630lsjt.pdfIn PDF document text
    • https://jagunafine.weebly.com/uploads/1/3/4/3/134363358/kafamopubuxuzin.pdfIn PDF document text
    • https://fusajebotiv.weebly.com/uploads/1/3/4/3/134320253/1762333.pdfIn PDF document text
    • http://triple-doska6.club/best_magic_animation_mods_skyrimm6yd7.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/rovuweraja/large_cardboard_sheets_staples.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/you_ve_been_booed_printable_free.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/34258377270.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/17033749186.pdfIn PDF document text
    • http://xivutunitilema.epizy.com/71020867070.pdfIn PDF document text
    • http://tidewoxawutose.epizy.com/86117979673.pdfIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/employee_grievance_response_template.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_off0000d45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45D 5456 bytes
SHA-256: 8f172934e612b6710ef93862da4e6323feba840716ebc7d924013bb93ea0bdff
font_01_sfnt_off0000e6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FF 10392 bytes
SHA-256: 73b08c753b622902dd3b7f32605806493792f57ea34bcebcaedd0e0d97ef0c28

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