Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdf951fbade26d36…

MALICIOUS

PDF

86.5 KB Created: 2021-05-18 05:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3bf76b37ee85f381bf65e4c3b2c7e9df SHA-1: c9123ced630bb0324c167f9ac53dfb080eb42c68 SHA-256: cdf951fbade26d36ba18b0e2a02673065c2fc23edae661b0bdce466e7ee03d86
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains an embedded URL that directs users to a suspicious domain, likely for phishing or malware distribution. ClamAV and ML classifiers flagged this file as malicious, indicating a phishing or trojan payload. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/wb?keyword=dog%20manger%20scene PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380209/normal_6059f50ae2101.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470014/normal_602d713410c5e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488092/normal_5fe3d5e22523a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407571/normal_5ff857082ece1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403822/normal_602587f540b5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464313/normal_605dd496052f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423728/normal_5ff7653d5b5f4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386613/normal_6000cc0680aaa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404969/normal_6056efffcd4b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417426/normal_602c592e8cedc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455174/normal_5fd9aafe7fa6d.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/e8a898f7-571b-41f9-a7b2-f1fea9008bab/62769729641.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d215b835-47d9-4fc0-847e-2b2df1797c39/stephen_kings_it_cast_2017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0708fbee-a411-4ced-90ac-a739a4271a51/how_much_money_did_50_shades_of_grey_book_make.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76234ead-0392-4181-ac88-bcdb4ff40724/50393226286.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21114dad-da88-4a41-89b6-e03ae95cd8a4/ronanoso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86f11d5b-7978-4e28-bdec-8fd974b994ff/49580865260.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7ae9821-aaf1-4ee0-b2b6-5b566aa031d0/feliz_navidad_tv_movie_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccc34e89-3470-4f9d-bca4-4ced19a9d3b4/vexakexalir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e960a3d-c8e0-4b7a-953f-107a34dc4f4a/how_to_fall_into_deep_sleep.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE598 5088 bytes
SHA-256: aadfa00cfc31172661316b9a1487943a6a759a28c0664fd03dee6206d2b85e6a
font_01_sfnt_off0000f6cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CB 7268 bytes
SHA-256: 048a80c975c83b8fdee05ac68832e2b798db3bb7ec52f6be8a3839bcef96ca19
font_02_sfnt_off00010f36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F36 11560 bytes
SHA-256: cfbf9244e0ecb82756e30c5842e251092b1d4516c53c92fc7af9939bcd0d52f5
font_03_sfnt_off00013684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13684 16344 bytes
SHA-256: 9c0b59d593f481c42a0bc6fa35291501d7cce0bda045d1a0c41de16a57cce5b4

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