Malicious PDF — malware analysis report

Static analysis result for SHA-256 30957578bc8fb31c…

MALICIOUS

PDF

78.6 KB Created: 2021-04-05 02:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d13e935d9ab7a21be17895d4bd75d919 SHA-1: b47b6c68331af9a9bba02e5e8efc03b827c5343a SHA-256: 30957578bc8fb31cca0bce921a54defe80bdc2ca7dd44e51c8dc5c57d2c37d41
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm, and one specific URL is flagged as a potential phishing or malware distribution point. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to a Samsung phone reset, likely to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://resalured.ru/strik?utm_term=samsung+galaxy+sm-t580+hard+reset
    • https://cdn.sqhk.co/wixexozesila/hagdvtZ/history_channel_directv.pdf
    • https://cdn.sqhk.co/gitaligido/iRrjjfU/72863175533.pdf
    • https://cdn.sqhk.co/genonitag/KN7ehgl/vuzazijusuwomabuxog.pdf
    • https://cdn.sqhk.co/dusawugivepo/KghiasA/xotemopifit.pdf
    • https://cdn.sqhk.co/xovepejegosi/igiabic/10980561629.pdf
    • http://tarenutufitox.66ghz.com/91745040845.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kiwizenodemi.epizy.com/11306412701.pdf
    • https://uploads.strikinglycdn.com/files/81431d55-97b9-441d-a125-fa546e98f971/south_carolina_permit_test_2020.pdf
    • http://xituduriximujat.epizy.com/zerabowiwafilut.pdf
    • http://jimatisejur.rf.gd/types_of_oil_burners.pdf
    • http://volitig.rf.gd/ejercicios_categorias_gramaticales_2_eso.pdf
    • http://zijapipote.rf.gd/essentials_of_cardiopulmonary_physical_therapy_3rd_edition.pdf
    • https://uploads.strikinglycdn.com/files/f23418cd-af0a-4673-8f95-94331e94f8ce/24501030008.pdf
    • https://uploads.strikinglycdn.com/files/507b0e71-8e11-4dad-8319-022e8c2aa5b1/7384613916.pdf
    • https://uploads.strikinglycdn.com/files/abada1db-5edc-4292-9958-f0e82d16dab3/porutozevutamenimuleto.pdf
    • https://be56f97b-0727-4a8e-a141-4155b83e75ac.filesusr.com/ugd/5034d0_8a929127ea1644d4bef6cebf5bcd31e7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f4e768db-7d62-4b8a-b2cd-1b0673566f56/norse_mythology_neil_gaiman_analysis.pdf
    • https://9f5bcc56-a059-4f00-ae85-604acd6a3d2d.filesusr.com/ugd/ac9354_5f89cbe5ab6e45fb918359060fae8b9b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c7a2b87c-1d2d-42cf-a9d9-f420c51d4b45/jafagasufe.pdf
    • https://uploads.strikinglycdn.com/files/c5af4fc6-3c86-449d-a418-b1126c54b76e/97411921392.pdf
    • https://uploads.strikinglycdn.com/files/16ae28e6-5088-4970-ab2c-55fea5836803/how_to_use_electro-tek_digital_multimeter.pdf
    • http://zufabilo.rf.gd/julalakov.pdf
    • https://uploads.strikinglycdn.com/files/df9fe878-c065-4842-a361-f0fa57c94597/nujal.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_off0000f22d.bin
c2d6ac968b86e29d206abf11322273764341d98701dac785ad473563fd9e6b40		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF22D 6004 bytes
font_01_sfnt_off00010677.bin
866066c43ffed2e25d9f118e897e351ac3099af5201b5402d7f7f01b6563e338		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10677 11308 bytes

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