Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8d9e6e25e428cf2…

MALICIOUS

PDF

78.4 KB Created: 2021-03-10 20:39:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 13ba17d7b98608cbe78056ace0af3838 SHA-1: 89e2fb1fe743f3be3ad6c1f25727bec4adf060c6 SHA-256: c8d9e6e25e428cf2b4489fb22e27819881531963498b746a3c40162d8f7e6d28
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://vilenefex.ru/wix?keyword=hotmail.com+login+forgot+password PDF link annotation
    • https://ruwizugaxuluba.weebly.com/uploads/1/3/4/7/134759804/xibegukavonaxati.pdfIn PDF document text
    • https://namazowofurap.weebly.com/uploads/1/3/4/3/134372349/9671818.pdfIn PDF document text
    • https://tufemetu.weebly.com/uploads/1/3/4/8/134887907/3da69009983e4e.pdfIn PDF document text
    • https://rikumuxazomibib.weebly.com/uploads/1/3/6/0/136082685/ruxunodebevi.pdfIn PDF document text
    • http://jasapremium.xyz/34377887367iptx.pdfIn PDF document text
    • https://sasominafa.weebly.com/uploads/1/3/4/3/134362810/79acaaea.pdfIn PDF document text
    • https://tekudijasefemo.weebly.com/uploads/1/3/2/7/132740256/woputudek-rapozezopelam-ravazorudi-xedezoju.pdfIn PDF document text
    • https://xupubiwe.weebly.com/uploads/1/3/4/3/134339906/padiw.pdfIn PDF document text
    • http://grafoanaliz.ru/american_society_aesthetic_plastic_surgery_annual_meeting9fmiw.pdfIn PDF document text
    • https://mapatujil.weebly.com/uploads/1/3/1/4/131454051/rageso.pdfIn PDF document text
    • http://cenderaoriginator.com/how_to_verify_cash_app_to_withdraw_bitcoinr47k6.pdfIn PDF document text
    • https://bifimazetaxa.weebly.com/uploads/1/3/5/3/135326975/181009.pdfIn PDF document text
    • https://benefirezunaxo.weebly.com/uploads/1/3/4/8/134864331/5371915.pdfIn PDF document text
    • https://xidelora.weebly.com/uploads/1/3/5/2/135296398/didexukusagefeg_fuvipusokazan_bilaved.pdfIn PDF document text
    • https://turoliletipusu.weebly.com/uploads/1/3/5/9/135969349/7897630.pdfIn PDF document text
    • http://terem.space/cbt_nuggets_ccna_voice_640-_461gtois.pdfIn PDF document text
    • http://present-mag.ru/answers_to_walmart_application_questionsq1ok0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sinadi/qualitative_and_quantitative_research_methods_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/xepululejiwof/breakdown_voltage_test.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/warlock_gear_guide_wow_classic.pdfIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/accidents_reported_today_in_augusta_ga.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/the_aerospace_corporation_email_format.pdfIn PDF document text
    • https://s3.amazonaws.com/jevelel/70900698144.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/vesanokonutep.pdfIn 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_off0000e849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE849 5560 bytes
SHA-256: 2840ea0b4420041d10b8eb2746e4dd9096b4ad4154dbd66ac7f50b73f3c2010c
font_01_sfnt_off0000fb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2D 15964 bytes
SHA-256: d670d13fce97184d8444cec1b50b0797407f884812ab8c0de0dfccaec32b4eec

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