Malicious PDF — malware analysis report

Static analysis result for SHA-256 f55c71f525c37997…

MALICIOUS

PDF

96.6 KB Created: 2021-05-04 11:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: d49c6180c92684092e58fcd0819c636e SHA-1: 0669dc868318b9adf73fd2ab41cfa8a086a1ef36 SHA-256: f55c71f525c379974a49da41bec2222efeed7612cfce67ad7323969fb332391c
186 Risk Score

Malware Insights

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

The PDF document was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous external URLs. The presence of a link farm suggests an attempt to lure users to potentially malicious websites, possibly for phishing or to download further payloads. While no scripts were explicitly extracted, the PDF structure and extensive URL usage are indicative of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jacksth.ru/strik?utm_term=mame+0.139+u1+romset+download PDF link annotation
    • https://jofudetazowus.weebly.com/uploads/1/3/1/6/131606688/9394662.pdfIn PDF document text
    • https://polerobozugewif.weebly.com/uploads/1/3/4/3/134344868/folujokimatemusolu.pdfIn PDF document text
    • https://ririzunok.weebly.com/uploads/1/3/4/7/134712782/litonomili.pdfIn PDF document text
    • http://hookup154.site/61960595546bpekm.pdfIn PDF document text
    • http://mattelipsticks.site/11441550280bpy8c.pdfIn PDF document text
    • http://repair-foto.ru/arcade_games_all_apk_uptodown9ugjz.pdfIn PDF document text
    • http://lemuxatazewazov.iblogger.org/car_brands_logos_and_names.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://992bddda-184d-467f-a815-0165b41a2208.filesusr.com/ugd/69695d_18efb37436154e04b058cff496ad2ada.pdf?index=trueIn PDF document text
    • http://pojozija.onlinewebshop.net/what_does_the_lion_symbolize_in_the_veldt.pdfIn PDF document text
    • https://eb72eaa1-ef55-40a3-a653-f6d21bccf295.filesusr.com/ugd/54913d_b24a890589224956a4c9b9f8dcd3adb5.pdf?index=trueIn PDF document text
    • http://fakesux.epizy.com/mefokux.pdfIn PDF document text
    • https://3d3b31fc-6152-41c7-b1d4-a4af3afcce63.filesusr.com/ugd/3f8d85_8b47ed3bc32148f18c989416dcbc4c68.pdf?index=trueIn PDF document text
    • https://f4b9ed98-44c1-44e6-9966-d9817cd43de7.filesusr.com/ugd/9ced5d_f12d86a22798498dbfba46e29362afb0.pdf?index=trueIn PDF document text
    • https://92fa68c6-d088-48c5-94d9-776fe0504fc0.filesusr.com/ugd/5a053b_9cfa29d4abe8416085c1c92fb6f0d915.pdf?index=trueIn PDF document text
    • https://4a1cfc67-5981-466d-a13b-75576fe7431f.filesusr.com/ugd/64e449_bcaf2d18190f4a1580e4c7b2120c4af8.pdf?index=trueIn PDF document text
    • http://lenobarokolubik.epizy.com/pathfinder_character_generator.pdfIn PDF document text
    • https://3c1efe6f-6e34-41bb-a2c4-2be85dd3cb33.filesusr.com/ugd/41f880_81f6696e44f040e48423659ceda1c39e.pdf?index=trueIn PDF document text
    • http://vewawisu.onlinewebshop.net/83974854976.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_off000133a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A7 5616 bytes
SHA-256: 5ad34adc704961eea17f827ee52aad45040e46058a5c8c2df54867fcf283a665
font_01_sfnt_off000146c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146C7 14800 bytes
SHA-256: 4a3ab109f0f82e62ee05baf4d1c902f07ec1c7864b032c13399bffd4c82b3dcc

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