Malicious PDF — malware analysis report

Static analysis result for SHA-256 49141e25efb43671…

MALICIOUS

PDF

92.4 KB Created: 2021-03-28 01:01:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: bc86be392418666a4e724dcbaf5fbe1b SHA-1: c0ada4e92e303a6509c032df61f7bc87cd9664eb SHA-256: 49141e25efb4367160890343a8660f24b71096501ebd8cebfa6cc29889b83f11
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. One of the primary URLs, 'https://golowaki.ru/award?keyword=histologie+de+l+appareil+digestif+pdf', is flagged as unknown reputation, suggesting a potential malicious destination. The ClamAV detection and ML classifier further support its malicious nature, indicating it's likely used for phishing or to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://golowaki.ru/award?keyword=histologie+de+l+appareil+digestif+pdf PDF link annotation
    • http://melotedi.iblogger.org/vomawowa.pdfIn PDF document text
    • http://fukipinegu.22web.org/36249146236.pdfIn PDF document text
    • http://momadogago.iblogger.org/viper_5305v_installation_manual.pdfIn PDF document text
    • http://hackins.site/plot_nullclines_matlabr1ln7.pdfIn PDF document text
    • http://pop-marketplace.ru/the_time_travelers_wife_explained9xm5g.pdfIn PDF document text
    • http://dkblogin-de.best/66259733580072uz.pdfIn PDF document text
    • http://alex-chekalev.com/ley_de_armas_de_puerto_rico_2020hkj14.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f2fffe36-c7b4-4b88-9608-518dc6c14750.filesusr.com/ugd/950b2a_851f49419ec142858b22e859a9508286.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/59354151076.pdfIn PDF document text
    • https://64f1e6a9-4530-4009-9f9b-67b91dd69f79.filesusr.com/ugd/76b6de_2e80f00a851e43a2b5901d8e5f56d3ce.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/gdpr_data_flow_mapping_template_free.pdfIn PDF document text
    • https://144c9d4d-401b-437b-b89f-6a5816d7da47.filesusr.com/ugd/cd33f5_8a7aeb077acc4f34aa7a675da47ced68.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sefabe/wenezenajovaf.pdfIn PDF document text
    • https://7605d98d-8b17-4a41-9383-f5c8d5af9bcc.filesusr.com/ugd/2bed4c_bf8033a5ee044f35802707e48719e03a.pdf?index=trueIn PDF document text
    • https://27dd58ca-3bab-4825-b0a2-cb75a9f796de.filesusr.com/ugd/aba4c5_59c83fb9f8344d9591098ac30769fcf2.pdf?index=trueIn PDF document text
    • http://dirunexodov.rf.gd/59333263655.pdfIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/form_arcosanti_music_festival.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/nufexunovaxu.pdfIn PDF document text
    • https://a32e93c2-1aa3-4149-af29-aa5d163ab988.filesusr.com/ugd/40336e_cbdf182ca5144d67b089b28e6267b3be.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/43633280840.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/38452564740.pdfIn PDF document text
    • http://petifogowiga.epizy.com/wawezo.pdfIn PDF document text
    • https://s3.amazonaws.com/dobikasukavu/pdf_to_dwg_converter_software_free_online.pdfIn PDF document text
    • https://3d5b2cfc-74f5-4c02-8466-0d369b02955c.filesusr.com/ugd/69b86f_67002cb99eea42d689755dffc4e6801e.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001136d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136D 5172 bytes
SHA-256: 034158c77f5220ee973343352112fe33b58f28d05ef276beb4ac1ab1ee29848c
font_01_sfnt_off00012511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12511 12416 bytes
SHA-256: 0704c01e3da02393ecbe51eda073668eae0450df8771abdee9e7bca80542bebe
font_02_sfnt_off00014cfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CFC 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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