Malicious PDF — malware analysis report

Static analysis result for SHA-256 738570d67b42b4d2…

MALICIOUS

PDF

62.8 KB Created: 2020-12-19 23:34:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d1509d77cbb35f5f8db5db155e5dc160 SHA-1: d24142b6cfcda3daaadae96a71da4e5594c9f5b3 SHA-256: 738570d67b42b4d27dcdee2ad29a23dbd20cd424a6ba780abfc5e84a89d2ca30
154 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/aws?utm_term=stem+and+leaf+worksheets+grade+6'. This URL is the primary indicator of malicious intent, likely serving as a lure for phishing or to download further malicious content. The ML classifier also strongly flagged this PDF as malicious.

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
  • 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.
  • 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/aws?utm_term=stem+and+leaf+worksheets+grade+6 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/4237330a-6db9-4d58-ae5d-ddbe064cebde/25202007459.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/948b0c49-2ebb-4da5-b91b-e7b2547bb2e4/68521454854.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc529e012facd59cec8ad00/t/5fcc2e647ae85b53b282ebb3/1607216740609/extreme_car_driving_simulator_drift_mod_apk.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc347c00a2757459bf24eac/t/5fc485624f98375720702547/1606714723213/how_to_make_floating_ladders_in_minecraft_1.12.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebf24415-5bb8-41de-aaed-6e34a059efad/bolatukisosobarosiwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8435d5ad-3905-42e4-b8bc-8ab9676add45/163842752.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef84a64d-8c87-4ec8-936e-4f6ded76afc9/christmas_tree_farms_lancaster_count.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e9036b97992eb55c1f46/t/5fc1186d2dd96f5918164da4/1606490222594/pharma_qc_interview_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8f68e0b-6b9e-4fbe-b3f8-e584e9811cc2/zazoniwure.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5d46edf132613bbdf5b61/t/5fc6fb77bfb90028be4587ea/1606876023821/vetav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59a3545c-729e-40d6-9bfa-bdf125482b1c/ver_ncis_los_angeles_3x17.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc53f52ea4a794d5661b4e5/t/5fd6720d491a58544a13c98a/1607889421525/ladamiputitegozupanefosoz.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4c63dd26ff1194f8cbdd0/t/5fc7b61c4f9413233b2b59a1/1606923804830/teponejurokevojoze.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_off0000ba10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA10 5736 bytes
SHA-256: 9b78b6a44e4a648c272d0a51c57681b7bf0fddbb1570445fea81aa7a3153a304
font_01_sfnt_off0000cd7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7B 9760 bytes
SHA-256: ad501c8861a5cc3f99c1085cbad62f7814d5ab832c9ef2f69c1ef0c3c4a81d78

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