Malicious PDF — malware analysis report

Static analysis result for SHA-256 5631a367ccecfbc4…

MALICIOUS

PDF

73.3 KB Created: 2021-05-22 19:37:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 64a05796696e8b514870e993a6656fb2 SHA-1: 494e7f0864e043617bde18b2d13ebb28e1773a82 SHA-256: 5631a367ccecfbc40e0b0ff436516510e941de40994e7752722bae8b1fb6537c
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF document detected as malicious by ClamAV and an ML classifier. It contains an embedded URI pointing to a suspicious domain, likely intended to deliver a malicious payload or phish for credentials. The document body is heavily obfuscated, but the presence of the external URI and the malware detection strongly suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/strik?utm_term=evaluation+cm2+cod+coi+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4379034/normal_5fcee7de9bb09.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404290/normal_5fe5e5e5035a2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a397aa58-6e90-43bf-af14-64adb08b8346/pezeradumazigowo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3499a08c-aea8-4f9a-a081-921785160292/4590476973.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/working_holiday_visa_sweden_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/ateneo_application_essay_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/389fa5c5-4740-4cff-8c11-3ed92bd54fd4/tanodiril.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fca2e736-e626-45de-a735-09a7c4948a41/66304690818.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/29519800121.pdfIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/al_fajr_azan_clock_cw05_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1333cf32-8c01-4175-9a77-394b7128d1f2/58598124019.pdfIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/64734220241.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/333b0e27-1dd2-44a1-bac6-f934b1ab662a/82758609259.pdfIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/flyer_templates_free_powerpoint.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/letter_a_alligator_craft_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/471384de-4685-4029-8bcf-d3a64c6e9e9d/how_to_make_formula_milk_for_newborn.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/584ac248-81cf-4e8a-be97-689291470692/hw-j550_rear_speakers.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/36325861986.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/517fed69-f207-47bb-8853-643995355e96/kamusadazogebapow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b720e8c-046b-4b63-96ac-549b7a5dc55c/the_hierophant_meaning_in_love.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_off0000ddd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD0 5176 bytes
SHA-256: 553fb6cbedbc0b1ad2acd8abba5dc5b16d00d4f71edc070fedfa750f3c40f966
font_01_sfnt_off0000ef75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF75 12112 bytes
SHA-256: 33df69116d4b9564ecbbe3e8ac93025cff80a1dad3ee8bd08af02641a1f1b16d

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