Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbbdfca280abb35b…

MALICIOUS

PDF

79.0 KB Created: 2021-03-22 21:56:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 799b09bef88533385bb6978063bc83a4 SHA-1: 09b1793288b74172d84fd2168bbb37880ff9df85 SHA-256: dbbdfca280abb35b72c860b3f5495b4edf1d0f9f3c240526b069f1a6dfef496f
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 pointing to Weebly and other file-sharing services, suggesting a link farm or a distribution point for malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and numerous external links are indicative of a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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=how+to+pass+utah+dmv+written+test PDF link annotation
    • https://lopazilavorelid.weebly.com/uploads/1/3/4/0/134097689/8470421.pdfIn PDF document text
    • https://varozowixofifop.weebly.com/uploads/1/3/0/8/130814066/206684.pdfIn PDF document text
    • https://cdn.sqhk.co/bokirebi/1jbieie/32247514119.pdfIn PDF document text
    • http://baramijotafexo.mypressonline.com/tarulal.pdfIn PDF document text
    • https://cdn.sqhk.co/tusifefovozu/gaEOzij/trains_on_time_game.pdfIn PDF document text
    • https://mewupevubuk.weebly.com/uploads/1/3/5/3/135387541/0c7fba1fd.pdfIn PDF document text
    • https://zifokodogip.weebly.com/uploads/1/3/1/3/131398222/5536045.pdfIn PDF document text
    • http://wobafobigo.mywebcommunity.org/pisune.pdfIn PDF document text
    • http://newipufisatag.scienceontheweb.net/how_to_open_a_sentry_safe_1250_without_the_combination.pdfIn PDF document text
    • https://lapadodipelij.weebly.com/uploads/1/3/1/1/131164402/judixe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d668ac4b-7052-46b9-8d0c-7e282d24ced7.filesusr.com/ugd/00fc84_b41100f8b1aa47b2afb923142fd81376.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/suzujewa/json_and_bson_format.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/gonobobu.pdfIn PDF document text
    • https://e8f98835-b194-42a5-b43f-fe2f29920dd6.filesusr.com/ugd/bf650e_2622a77704684cd2aae9a967028b46b6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/the_financial_institutions_development_fund_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/sixolose/barnston_primary_school_ofsted_report.pdfIn PDF document text
    • https://03ca3561-abfe-48ca-9b59-b1b2b77f8126.filesusr.com/ugd/1af49e_0fa1ede62faa434ca8846f5133c60865.pdf?index=trueIn PDF document text
    • https://49432a94-54bc-4d13-9d12-ea41d731e1b8.filesusr.com/ugd/a7c689_05a25366fbd7483db088f0cd3c6c32e0.pdf?index=trueIn PDF document text
    • https://189c2d36-84ff-4b81-9465-96c33c1d3b91.filesusr.com/ugd/35ddae_41a2a1cee22b41a8a5eb2c797211a8c3.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF774 5280 bytes
SHA-256: 696a9c866f5237c4d21c144d859153517c85c79b605aa7e411047929cc16bdeb
font_01_sfnt_off0001094c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094C 11000 bytes
SHA-256: 93ce0992c74866b742dcf847142ef46416cc42e7f713db54a11d7eaf349093a1

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