Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0c5a125dea25d4c…

MALICIOUS

PDF

77.4 KB Created: 2020-11-19 20:24:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 8d37531cf0612d23420a7a7a0369ff0e SHA-1: 30ef8943dc98dcc9f0d22f38c234e29ba11ab6e4 SHA-256: d0c5a125dea25d4ce42d48592be0fc1bfcaa67783e3a9ebe4f6ad9d60234184c
162 Risk Score
Tags
free-cdn-ebook-manual-lure

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://cctraff.ru/123?utm_term=thank+you+notes+for+nursing+preceptorships'. This, combined with a high ML classifier score and ClamAV detection, strongly indicates a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to 'thank you notes' and 'preceptorships', likely a lure to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://cctraff.ru/123?utm_term=thank+you+notes+for+nursing+preceptorships In 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/e70e2bf6-6320-4413-ac7c-0742841b4dca/zinegegeborurokizixuzop.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/modals_of_deduction_and_possibility_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65a1aac1-fc69-4fcb-b801-3d25f5308ae1/68779676610.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/1109153591.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuwaterexaf/roblox_hotel_story_game.pdfIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/sql_format_timestamp_oracle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d08af852-604d-44a7-805e-9820dd22d95c/59150751582.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2e17fdd-3381-42dd-bcf9-4b92ca91c9d6/rokigikonutononafazulis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90f4c6ee-bb57-437a-8c26-6385220b65f5/unidad_de_masa_atomica_del_hidrogeno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bff24fb3-f987-4f1f-b282-2a2def3b3269/tixomonaposot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f83f101f-6654-4d5d-b178-9bef5b93c7cf/selmer_flute_serial_number.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/the_maze_runner_read_online.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_off0000f17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17F 5360 bytes
SHA-256: 8ab0cf161e99cb2e8cf4f8ffdb2bdc194b3050f03155403ed1a0ef19a169ea45
font_01_sfnt_off000103cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CB 10676 bytes
SHA-256: 0fde2295620d3f981daaed9cd5ee0f98f7d37cb26194708781f251b203022283

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