Malicious PDF — malware analysis report

Static analysis result for SHA-256 48a55d29aedb50f7…

MALICIOUS

PDF

83.4 KB Created: 2021-06-03 19:12:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5e61ceff08e3de103e8d3f206c3acffe SHA-1: 0ddf1696a00a0950d5c130317d542cd73b581428 SHA-256: 48a55d29aedb50f77513add6b98f11b06c2101fabe13db08a94bd69cc99847f1
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are disguised as search results for popular game-related terms. This behavior is indicative of a link farm or phishing campaign designed to direct users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://krisoc.ru/pbw?utm_term=pubg+mobile+pc+sensitivity+settings+2021
    • https://lonawojalokofa.weebly.com/uploads/1/3/1/3/131382346/3486113.pdf
    • https://cdn-cms.f-static.net/uploads/4421472/normal_603224626c85f.pdf
    • https://cdn-cms.f-static.net/uploads/4375694/normal_5fd68628cf19d.pdf
    • https://static.s123-cdn-static.com/uploads/4451374/normal_5fe2615c339e5.pdf
    • https://static.s123-cdn-static.com/uploads/4377115/normal_5ff335688d034.pdf
    • https://cdn-cms.f-static.net/uploads/4464523/normal_606e940ebd7f5.pdf
    • https://cdn-cms.f-static.net/uploads/4372085/normal_605d9233b0f9f.pdf
    • https://cdn-cms.f-static.net/uploads/4484126/normal_6041762b30ad4.pdf
    • https://cdn-cms.f-static.net/uploads/4366343/normal_5fd1bb4b1ecdc.pdf
    • https://cdn-cms.f-static.net/uploads/4449776/normal_603421c422ead.pdf
    • https://cdn-cms.f-static.net/uploads/4402486/normal_60485fdf25968.pdf
    • https://rifakinuzofu.weebly.com/uploads/1/3/0/8/130815009/3166733.pdf
    • https://cdn-cms.f-static.net/uploads/4407664/normal_6061577801bea.pdf
    • https://cdn-cms.f-static.net/uploads/4393026/normal_605b956168cdf.pdf
    • https://cdn-cms.f-static.net/uploads/4447669/normal_60b8efc087dc6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tiduxikuve.pbworks.com/f/kurosi.pdf
    • http://tisowowuduwe.pbworks.com/f/28106939969.pdf
    • http://wejojixi.pbworks.com/w/file/fetch/144424404/discussion_questions_for_who_moved_my_cheese.pdf
    • http://mujefapufefi.pbworks.com/w/file/fetch/144521526/archeage_daggerspell_build_2020.pdf
    • http://niwomif.pbworks.com/f/engineering_materials_properties_and_selection_9th_edition.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea38.bin
e0d25ec69b446afca9ee08de353edadf596222d021552da55e156b7c5ff4fd39		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA38 5576 bytes
font_01_sfnt_off0000fd40.bin
61f036ebe7dcaf5480afc46659306af8f089445b2b4adad9d1f51bc1bbfc9c2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD40 10248 bytes
font_02_sfnt_off00012080.bin
49933e39fa926a1335ea2750d094d2c473b4f807b29c37830249021d38a0ee94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12080 18672 bytes

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