Malicious PDF — malware analysis report

Static analysis result for SHA-256 41135c37719ed7ff…

MALICIOUS

PDF

89.9 KB Created: 2021-02-25 23:55:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 7d77ba90716617a9100b6d2c2c1a7c4f SHA-1: 9fa8ce52ead5ba4c96346465f7736149ed0d9e55 SHA-256: 41135c37719ed7ff646995fc4a1c67158ce7959cbf34c49934ef0992181ad4c9
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support this assessment. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious content.

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
  • 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://crophysi.ru/123?utm_term=the+art+of+happiness+dalai+lama+and+howard+cutler In PDF document text
    • http://price-list.moscow/audacity_download_free_windows_101ooqj.pdfIn PDF document text
    • http://tokexal.medianewsonline.com/50938763047.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fakuguvil/53090210787.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/b_pleated_sheet_vs_alpha_helix.pdfIn PDF document text
    • http://morufigalolo.rf.gd/emergency_medicine_residency_programs_in_texas.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/training_coordinator_cv_template.pdfIn PDF document text
    • http://wutejaxevewef.myartsonline.com/operating_in_the_courts_of_heaven_robert_henderson.pdfIn PDF document text
    • https://s3.amazonaws.com/fonibinaraj/79787901202.pdfIn PDF document text
    • http://jatojitax.rf.gd/25523633884.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/akshay_kumar_film_kesari.pdfIn PDF document text
    • http://zigubogujivo.epizy.com/pubijivewosilukegek.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/abcd_movie_free.pdfIn PDF document text
    • http://doboroguvenuv.epizy.com/smart_vpn_client_draytek_android.pdfIn PDF document text
    • https://s3.amazonaws.com/tezude/android_10_para_oneplus_6t.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11529 5320 bytes
SHA-256: 595044a2e071f49ae49a0780265d7fa21d336ebc4cca5f51b76d472b7a9a8263
font_01_sfnt_off00012724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12724 10812 bytes
SHA-256: 95772b59168a35bec830e54fe3e735548cd8f67aa1871a379538d197120e6690
font_02_sfnt_off00014c11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C11 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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