Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f4ce0d0a825d467…

MALICIOUS

PDF

131.1 KB Created: 2021-05-02 04:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1eb118c14c95a53b4069a2a45479e147 SHA-1: 6aa1a4ae71fcff2fb3b80ecc797be420424311d1 SHA-256: 9f4ce0d0a825d467f732a974c4446c6b6328cab22d27e2b5be7e20034157b00e
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a 'PDF_SEO_LINK_FARM' which indicates a large number of external links, with the primary malicious URL being 'https://jumiwimov.ru/strik?utm_term=2+look+pll+ruwix'. ClamAV also detected this as 'Pdf.Phishing.Trojan'. The presence of embedded URLs and the ML classifier's high confidence score further support a malicious classification, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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=2+look+pll+ruwix
    • http://zotoxilob.getenjoyment.net/kepimogafiwogaruf.pdf
    • https://cdn.sqhk.co/konafomaz/dgdErfo/skywars_maps_for_mcpe.pdf
    • https://cdn.sqhk.co/dugelabomaw/ghgfehg/spy_king_bullet_puzzles.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nazekisigiduz/78466640729.pdf
    • https://599b09cd-7b6a-4758-94a3-08a08d316165.filesusr.com/ugd/628a76_35e0acb13ccd46baa992437ffda29b86.pdf?index=true
    • http://jizagedades.rf.gd/bernhardt_langrisser_guide.pdf
    • https://s3.amazonaws.com/lakujusitejojet/kimowuf.pdf
    • https://s3.amazonaws.com/tobovunoberiki/43483256624.pdf
    • https://s3.amazonaws.com/pokixovuxik/77096369887.pdf
    • https://91953a53-6f32-4f2a-9b2e-0f954541ff31.filesusr.com/ugd/dad90e_a0f86e19c31d4b3c9cf735fadea8b224.pdf?index=true
    • http://jopatodorijapu.epizy.com/map_of_world_oceans_and_seas.pdf
    • http://nurupejizijij.rf.gd/how_to_reset_kenmore_400_washer.pdf
    • http://dubanexotokegel.myartsonline.com/is_my_dog_allergic_to_peanuts.pdf
    • https://20128683-61eb-4207-b985-d468b1a81fea.filesusr.com/ugd/0049ca_2135790cbe4b44c2af9e48423edc6c51.pdf?index=true
    • http://zotikatisi.rf.gd/81881742969.pdf
    • http://falogivaxaf.epizy.com/29437833200.pdf
    • https://s3.amazonaws.com/bevarolimesale/calabar_cultural_songs.pdf
    • https://be9ca920-c372-4566-b00d-544f92814f3b.filesusr.com/ugd/f0c5a9_e2db8d2cf5254cd186ae4822eaec6f2b.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000175bf.bin
e3f2e6cef804c00575d1480701fa55216914743635b9e67a5929b422ccce773f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x175BF 5092 bytes
font_01_sfnt_off0001879f.bin
f35e0b8a69afa7eceda1f8e8edd2995015b2d6baf811856793d86c4993dfc914		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1879F 4688 bytes
font_02_sfnt_off000197b2.bin
7f38c7bd3076d5ec567b373f8788658f617417f44aeaffad1c2d563936ecbb0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x197B2 2268 bytes
font_03_sfnt_off0001a1c2.bin
20dfccdddbb11315adee4220ba226602d5faf420aa929d97484f1b2ff6293fad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A1C2 15472 bytes
font_04_sfnt_off0001d190.bin
4ef9506ee11a349461550e6b437e3786686b598308a87786035880d16624999d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D190 16060 bytes
font_05_sfnt_off0001e664.bin
07990c971d868c9d8705fce9b1c26dae4c0bcaee563b96058bcb9f093172747d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E664 16844 bytes

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