Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ae86de8f5040194…

MALICIOUS

PDF

88.1 KB Created: 2021-03-09 17:49:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f63eae01e0b9d950f71190302268ab77 SHA-1: fd05f8131722e5941eb58616f03376c430a3d667 SHA-256: 6ae86de8f5040194d976962d582acb9b71ba9aed47776b7d04fc8b8e4fd7abc6
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, which is a strong indicator of a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm the malicious nature of the file. The document body, though heavily obfuscated, suggests a lure related to 'Essentials of clinical infectious diseases pdf', likely to trick users into clicking the malicious link.

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
  • 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://pelibifir.ru/award?keyword=essentials+of+clinical+infectious+diseases+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4475196/normal_600740189c8f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481164/normal_603b30111e646.pdfIn PDF document text
    • http://xejitifuwoligaf.mypressonline.com/bijapopixelawa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470385/normal_5ff5867296127.pdfIn PDF document text
    • http://golixudib.mypressonline.com/pulorisuwimasuvak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490256/normal_60129b4e87229.pdfIn PDF document text
    • https://zedasadexim.weebly.com/uploads/1/3/0/7/130775923/ecc8b066f.pdfIn PDF document text
    • https://rogebanapixiwo.weebly.com/uploads/1/3/5/3/135343373/taxegavukad.pdfIn PDF document text
    • http://bamebefexa.22web.org/sejonomuxafejosumovuso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426549/normal_5ff00bc88cede.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463010/normal_5fcf0e12a4fd0.pdfIn PDF document text
    • http://rarurude.22web.org/beautiful_s_letter_hd_images.pdfIn PDF document text
    • https://xijiruxexewige.weebly.com/uploads/1/3/4/7/134725886/ddb854a.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/jarawaxanivu/android_studio_push_apk_to_emulator.pdfIn PDF document text
    • https://s3.amazonaws.com/kubedukowug/system_analysis_and_design_short_notes.pdfIn PDF document text
    • http://zilanun.epizy.com/red_cross_first_aid_course_online.pdfIn PDF document text
    • https://s3.amazonaws.com/voxazedisula/splanchnic_mesoderm_forms.pdfIn PDF document text
    • http://kedukalof.epizy.com/what_is_oxygenation_index.pdfIn PDF document text
    • http://vujipopeb.rf.gd/bitdefender_free_crack.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/bopisizomejedate.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_off00011f41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F41 5008 bytes
SHA-256: b46ef5e96d1264a86bba529ba70298c4254b262c885945dda0c5ff61321e05af
font_01_sfnt_off00013067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13067 10208 bytes
SHA-256: 9d1c8bf0dde9b134bc4a16e2200aa71b89d5c3ad28507e013a79d725c44b86f4

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