Malicious PDF — malware analysis report

Static analysis result for SHA-256 29963a5b9e444f32…

MALICIOUS

PDF

77.7 KB Created: 2021-04-03 04:59:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6f8680f81e8fcd29744378c045e24c94 SHA-1: a94fcf6eaf69514af9275313f262fb9e449a3a3c SHA-256: 29963a5b9e444f324973577965aa6dab5973ff490f2a54297e90eeaa2573ad3b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm, suggesting a malicious intent to manipulate search engine results or direct users to potentially harmful sites. The ClamAV detection and ML classifier strongly indicate malicious content, specifically identified as a phishing trojan. The embedded URLs, such as https://kuzutuzo.ru/award?keyword=septoplastia+nasal+pdf, are likely used for SEO spam or to redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://kuzutuzo.ru/award?keyword=septoplastia+nasal+pdf
    • https://cdn-cms.f-static.net/uploads/4401515/normal_5fd271283ee9c.pdf
    • https://xugoxuxilolikat.weebly.com/uploads/1/3/4/8/134860817/wiguwubog-zitiguwobizobu.pdf
    • https://mesofozup.weebly.com/uploads/1/3/5/3/135351624/nenixek.pdf
    • https://cdn-cms.f-static.net/uploads/4483345/normal_5fe70c3c598be.pdf
    • https://rewesiriwo.weebly.com/uploads/1/3/4/3/134318955/6102fa4a5d27.pdf
    • https://cdn-cms.f-static.net/uploads/4501046/normal_5fd6625341ede.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/cbb845d5-5ce0-40bb-8b38-9cc246e98388/saga_graphic_novel_volume_11.pdf
    • https://uploads.strikinglycdn.com/files/e8a5bfa2-e221-45c1-a302-c62cbed1b8a1/68568526087.pdf
    • https://000bb656-a8cb-4e8b-9327-0b0ec99f56fe.filesusr.com/ugd/3f812e_d948e396e0cb4693bc59cb6eba46eef2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/01a1f205-2fc7-48ba-8e4b-44c6d51d3ff6/what_does_the_fall_of_the_house_of_usher_symbolize.pdf
    • https://144ece88-722e-4d59-a9d1-ae16887514c2.filesusr.com/ugd/48b17f_872e7818839b44678b09d11e1482874e.pdf?index=true
    • https://0c43c058-97b3-435a-b041-a9f001bfa883.filesusr.com/ugd/791d74_ddfb7e91ba4c4ba39daf6c0309eb6bc4.pdf?index=true
    • https://ee42ee57-4547-4a8c-8a66-6cccb7f6869d.filesusr.com/ugd/2a9ad2_2f68a291845e47b1a57bbb24a7ab5791.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e30f86dd-ce5b-4de1-afb8-aaf4ba3d7c6c/basic_english_worksheets_year_7_free_printables.pdf
    • https://e40da922-b0e4-44be-9878-2d4898ccab21.filesusr.com/ugd/3a38e0_e925fe680def4295a839c5d22ec371c1.pdf?index=true
    • https://cd70d4e5-4a1a-4071-96d1-f2415ea5ece1.filesusr.com/ugd/7f46b5_f73e5a8a0ceb4c41b142afde2af4d6ff.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8abc5480-1e73-48f0-966d-d42a9430a943/piano_sonata_no._14_moonlight_sonata_-_beethoven_mp3.pdf
    • https://db6d201d-bdff-4648-9982-d9cfaac7639e.filesusr.com/ugd/98857b_4ec48136f0af4a97bc2ec0d440292db3.pdf?index=true
    • https://d89d6b52-6e76-4e18-bccb-bd7428cfddad.filesusr.com/ugd/02beb7_945c976aff0f4b54ae2d9c3d87f80b1a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ddfe57bf-c671-4ed5-94c4-a39630642c58/2521919464.pdf
    • https://uploads.strikinglycdn.com/files/2c238a60-89e9-4cb0-9d96-2284aa499e25/my_voice_will_go_with_you.pdf
    • https://uploads.strikinglycdn.com/files/45f308ab-5165-4945-971c-b2182d4031df/xibasudiluleror.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f222.bin
54cb469d061b18dba9f36d7ba0cae546cb1f982e6c419105b3552513b3322a5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF222 5044 bytes
font_01_sfnt_off00010360.bin
1dc1c583323516212974de07cd9bacb352c619bf9ee0a9ff7be0d27db70b30d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10360 11236 bytes

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