Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa409dc329817b21…

MALICIOUS

PDF

81.0 KB Created: 2021-03-08 19:40:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ebb92b1defdfdb258b938f71e20389c1 SHA-1: fe7d4431d0baf747930be98f5165df4966b51504 SHA-256: fa409dc329817b21c40fd841fdec6482ada1f09ce72adf32ec1aad5f6b23ad52
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9995

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://maypoin.ru/123?utm_term=find+the+circumcenter+worksheet PDF link annotation
    • https://nogiwesetegi.weebly.com/uploads/1/3/1/6/131637024/vumolufufasiloxosi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418565/normal_60250c5abf50a.pdfIn PDF document text
    • https://dowusezawidi.weebly.com/uploads/1/3/3/9/133997386/2425540.pdfIn PDF document text
    • https://jajadonafusava.weebly.com/uploads/1/3/4/0/134040597/pezuvizibij.pdfIn PDF document text
    • http://debodopox.iblogger.org/diabetic_foot_infections_treatment_guidelines.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451927/normal_602e369fb2839.pdfIn PDF document text
    • https://zujujoweb.weebly.com/uploads/1/3/5/2/135297083/xawifuk_zetuved_zoxoser_babevesiromije.pdfIn PDF document text
    • https://fujinimozebuxe.weebly.com/uploads/1/3/0/7/130738673/bivowudu-tolejireb-biwosepazefe-rusuzobula.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416504/normal_5ff58c15d48c4.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/nilititonawafim/xotozebutoromagudelosusub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7818e47-18dc-4411-aff7-8335084a6f09/mental_strength_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/wutisigila/what_is_the_plot_of_the_magicians_nephew.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/juvebulorejip.pdfIn PDF document text
    • https://s3.amazonaws.com/xujitezu/broadcast_package.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/excel_vba_application._worksheetfunction._averageif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9567fd0b-658d-48ed-b619-0b200cfda0f1/25129839392.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45124116-ff10-46b2-b730-4c80dba5e044/rajeki.pdfIn PDF document text
    • http://suziwifu.rf.gd/data_analytics_certification_classes.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/jojupakakutisanukaje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7751aacb-20bb-4c0a-b870-ba95b2b890c9/ryobi_10_drill_press_review.pdfIn PDF document text
    • https://s3.amazonaws.com/kimone/guideline_variation_classification.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7963064-3380-4441-81d8-d66f43ee9133/59480195082.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
    • 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_off0000ea89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA89 5048 bytes
SHA-256: bdff81d7ef9625c884e196232069d9e3b06c3e5473ea9e4cf41eb1733cd5739e
font_01_sfnt_off0000fba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA1 11200 bytes
SHA-256: 0b85b932970fda976987b48c41ef0fba7a77eb9fc3b821b86fae2416b2ce56f6
font_02_sfnt_off000121c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C4 16060 bytes
SHA-256: 84d5bd19c210eb3b73ecc14096ab1e56fdfb5b80ce7ba4f0052c67c0c2b02727

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