Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f0a825e0853afdb…

MALICIOUS

PDF

79.7 KB Created: 2021-04-14 10:07:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 791a1db88fe4a16fb750c1c774141b38 SHA-1: 1113113a998d41afa30185120f34efe1265e64a1 SHA-256: 4f0a825e0853afdb8e6b6262ba1df89a3f407e320fedf5427f626d388da710ce
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URL that appears to be a phishing lure, disguised as a search result for an educational degree. The PDF structure itself does not contain executable scripts, but the presence of the malicious URL strongly suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=online+computer+networking+associate%2527s+degree PDF link annotation
    • https://cdn.sqhk.co/wupetutigo/LvY1ihz/13241589869.pdfIn PDF document text
    • https://cdn.sqhk.co/riwifesineji/haibyhi/land_rover_defender_1990_review.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479684/normal_5fde049d1703a.pdfIn PDF document text
    • https://cdn.sqhk.co/nowovadizeb/egcgehh/69010625304.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425924/normal_5fc72944b32fc.pdfIn PDF document text
    • https://cdn.sqhk.co/kinerufi/vgiiahe/happy_birthday_sheetal_cake.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/gawabog/kyocera_duraforce_manual_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92b3e76d-0660-4cb3-83d1-054aa865b081/define_navajo_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f17287b-d977-4e10-9d10-b8c8779a8833/10502162684.pdfIn PDF document text
    • https://s3.amazonaws.com/jawusawar/country_violin_music_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74ad9b46-d97a-48a4-8cb1-12a9507a49ff/telsta_a28d_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/sakigo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/325d2194-eec4-48fa-b7db-d956244d627b/real_estate_law_of_contracts_practice_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6781bfcf-ed30-4342-82a9-12a6aa229552/86076948249.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74dc4d7c-8c54-4f73-a6f2-c8bd51001552/pogivixepikafosot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08fd07ee-57ee-4c9a-8605-8e841ceb8b47/bosch_800_series_dishwasher_with_crystaldry_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/the_blue_book_for_car_prices.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfb4cc12-13d0-40b2-83b4-b7971e62a720/how_to_set_emergency_heat_on_nest.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/28538095146.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_off0000f939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF939 5612 bytes
SHA-256: 3faf8140cd3d81b893eb2ca10c4b9d9bf2cdc20c39687f54c6fe05fa02ea6f9b
font_01_sfnt_off00010c51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C51 10952 bytes
SHA-256: 00b30ecad843c6288c17e6ddbdfaa76fa417043c4020ce7a757b35dac109d2c3

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