Malicious PDF — malware analysis report

Static analysis result for SHA-256 5199ccb36b5ef9bc…

MALICIOUS

PDF

80.5 KB Created: 2021-04-08 01:18:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 66a040e64ffb2fb344bd2211a6d45795 SHA-1: bc19510a5ac30ecc835c9d25b214e80cd980a635 SHA-256: 5199ccb36b5ef9bc89b8c9ba7e11da174bbb8ff9e9213abcb7f6d1d4ba0db577
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a link farm and is detected as a phishing/trojan by ClamAV. The embedded URL 'https://jumiwimov.ru/strik?utm_term=xfinity+remote+codes+5+digit+sony' suggests a phishing attempt disguised as a search result. While no scripts were explicitly extracted, the PDF structure and external links indicate a malicious intent to redirect users to potentially harmful content.

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-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://jumiwimov.ru/strik?utm_term=xfinity+remote+codes+5+digit+sony
    • http://xenipufuk.22web.org/binobeberanabuku.pdf
    • https://cdn.sqhk.co/fukonovum/jgcge4s/army_list_builder_40k.pdf
    • https://cdn.sqhk.co/wazilisiko/iiE6jgM/32772109686.pdf
    • http://bepibolet.22web.org/election_2020_date_list.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b1706aec-e9b1-4c6c-9a93-f14ef4a1c402.filesusr.com/ugd/3b47cb_71642ed7d8a6474ca19f4784886f7031.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1dd73a96-ad8a-411f-8208-96e26249eba7/mibininobuzaf.pdf
    • https://s3.amazonaws.com/dovulavavo/uniform_store_center_city_mall_paterson_nj.pdf
    • https://uploads.strikinglycdn.com/files/63d4456e-48f9-4451-ae24-a9e9c83028d4/final_fantasy_vii_official_strategy_guide.pdf
    • https://11627308-8c8f-4f08-99ed-0ad85160907d.filesusr.com/ugd/682d1c_70e03edaa23f46b79073555ecd792cb3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/49f96048-e21d-4af1-908b-c37bf523048e/58280971337.pdf
    • https://s3.amazonaws.com/firudegix/multiplying_and_dividing_fractions_worksheets_year_7.pdf
    • https://uploads.strikinglycdn.com/files/27b92785-4b12-4b20-9744-327764551a5d/jekeziwunepusuxafa.pdf
    • https://s3.amazonaws.com/rebesudanolo/tikal_guatemala_travel_guide.pdf
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_98d4dcd42594417f986c59fcfc120a50.pdf?index=true
    • https://b7eb3c74-9f10-4efd-a612-efb7ea03662f.filesusr.com/ugd/7198c1_806b3f283ab54b5fa44d4c0a9b559618.pdf?index=true
    • https://994180ce-385f-4272-9833-4a204a825e0f.filesusr.com/ugd/ec0c41_7cad30336c1c4d6f8029775922f16129.pdf?index=true
    • https://c36efdde-2309-4ce2-a10d-b6df2ce12cd8.filesusr.com/ugd/e98059_6ec53af472ba4d18bd4beae2e91b4112.pdf?index=true
    • https://6c71f620-b6e5-46cc-9e58-526c5f0a7a41.filesusr.com/ugd/1c90dc_67884636d9ab4f6e9612a129be12becc.pdf?index=true
    • 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_off0000fbf8.bin
7fcc3fb000f078b8eb3fdcb18cb5a9e7e05c776865205e98f1695fb1896ac8ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF8 5300 bytes
font_01_sfnt_off00010e02.bin
df86e51dfd1cf5b0e62dd66b9c5424177802500a483d022041b4fedf565d8625		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E02 11448 bytes

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