Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fc7bb7b53a05af0…

MALICIOUS

PDF

83.1 KB Created: 2021-03-24 17:38:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 925744f136b02e9b6e93b9bb29ed442d SHA-1: 10ec27f9103b94381a9414068c3b9b1303a223fd SHA-256: 1fc7bb7b53a05af023d3008cd6d253441901bdffa7934593343e07694fa6c01c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://maypoin.ru/wix?keyword=stick+wars+unblocked+games
    • http://ersoil.fun/3694771667799hft.pdf
    • https://jepejopik.weebly.com/uploads/1/3/4/6/134610321/8c9dda6.pdf
    • http://grampus-shop.com/noguxigezazox1xotk.pdf
    • http://rollernefritmassage.xyz/walking_dead_graphic_novel_volumes9wlh0.pdf
    • http://want-seo.ru/transferir_game_center_para_android6wfvi.pdf
    • https://tavadubamik.weebly.com/uploads/1/3/4/4/134473349/jakafikase_magem_buxepa_kufekifiruk.pdf
    • http://torinib.iblogger.org/encyclopedia_of_general_knowledge_by_caravan_publishers.pdf
    • https://wemadaxofopu.weebly.com/uploads/1/3/4/7/134752229/6918479.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://7fe6b731-3703-45da-bcbe-faf39b4d3392.filesusr.com/ugd/880a7e_17b0b3cd10d44cff93bb40b3aac0657d.pdf?index=true
    • https://s3.amazonaws.com/voropa/nessun_dorma_sheet_music.pdf
    • http://zixoridepub.rf.gd/barbados_weather_report_today.pdf
    • https://s3.amazonaws.com/libusamagowuvo/wileziner.pdf
    • https://94ac7338-8c66-48ed-b7e4-01cccba3eff0.filesusr.com/ugd/9b8421_2da9171a9bd04adb80500c336c041a6b.pdf?index=true
    • https://s3.amazonaws.com/bisiku/convert_kindle_to_on_ipad.pdf
    • https://s3.amazonaws.com/wolawatin/wodorupivaxedona.pdf
    • https://s3.amazonaws.com/lorifawuvawot/the_pardoner_s_tale_quiz.pdf
    • http://sojuwumupipijo.rf.gd/5435393420.pdf
    • http://mukovixajetunex.epizy.com/why_does_my_harman_kardon_bluetooth_speaker_keep_turning_off.pdf
    • http://tivogowajap.epizy.com/54060384441.pdf
    • https://850a36a1-966c-46c3-86ed-e15bcb5778a7.filesusr.com/ugd/ede58b_bda4d3ef638342d886f716d55402c894.pdf?index=true
    • http://lisunamubeso.epizy.com/wogidikejurupepewuzew.pdf
    • https://b24182fa-1fee-416c-9f57-41d8a36573e1.filesusr.com/ugd/1cc367_407e1db1d6ba44c5ab18fafcd0dd2127.pdf?index=true
    • https://4c72699b-aa2e-4dc8-8bd5-1a54e8f938a6.filesusr.com/ugd/f3cb45_f6f9185def2449c389a8832867c40126.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f696.bin
67b76b302b9002a36eccd98611f04acbb1fc04f94a433dd2259d5fe89593f07b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF696 5540 bytes
font_01_sfnt_off0001095b.bin
bcfe3774ea35886f0aef5733aa2b603a7be17c4816e2ca36a388b8c9bd950497		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1095B 11828 bytes
font_02_sfnt_off00013070.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13070 4324 bytes

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